Dimethyl Sulphoxide-acetic anhydride reagent converts 1,3-indandione to the ylide (2) and a much awaited dimer (3) at room temperature. However , when 1,3-indandione was interacted with pre- heated  DMSO-acetic anhydride  at  waterbath temperature it affords an unusual trimer (4) and a novel compound (5), methine-tris-1,3-indandione  along with the ylide (2) Key words: DMSO, Acetic anhydride, Indandione,Ylide Trimer

Khan, K. Z.

Zargar, N. D.

English

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Chemistry and Materials Research                                                                www.iiste.org ISSN 2224- 3224 (Print) ISSN 2225- 0956 (Online) Vol 2, No.2, 2012  17 Synthesis of Unusual Trimers in 1,3-Indandione                                                           N. D. Zargar* and K. Z. Khan Department of Chemistry University of Kashmir Srinagar -190006 (J & K ) India                              * E-mail of the corresponding author :  nded.1092@rediffmail.com   Abstract Dimethyl Sulphoxide-acetic anhydride reagent converts 1,3-indandione to the ylide (2) and a much awaited dimer (3) at room temperature. However , when 1,3-indandione was interacted with pre- heated  DMSO-acetic anhydride  at  waterbath temperature it affords an unusual trimer (4) and a novel compound (5), methine-tris-1,3-indandione  along with the ylide (2)  Key words DMSO, Acetic anhydride, Indandione,Ylide Trimer. General information Melting  points were taken on a Tempo block and are uncorrected. Spectral data of the compounds was recorded in RSIC Punjab university India.  Materials DMSO was carefully dried according to the standard procedure. All the solvents used  were of AR grade Introduction Dimethyl sulphoxide acetic anhydride, a versatile reagent has been  a subject of reviews 1-5 with a wide range of chemical applications. It brings about oxidation of secondary alcohols6,  oxidative - rearrangements7,   formation of methylene- bis- adducts, oxidative degradation and oxidative cyclisations in different β –diketones depending upon the reaction conditions and structure of the diketone . This reagent also converrs 4-hydroxy coumarins and its substituted derivatives , under varying conditions , to a variety of products of both mechanistic and chemical-    interest 8,9.    In view of this it was considered to investigate the reactions of 1, 3-indandione with DMSO- acetic anhydride under different conditions.  Experimental A mixture of DMSO(16ml) and acetic anhydride(8ml) was heated at water bath temperature for two hours. Then 2 grams of 1,3-indandione was added to it and the reaction mixture was kept on a boiling water bath for 12 hours. Tlc monitoring indicated formation of a number of products. Removal of solvent under reduced pressure afforded a red colored solid which upon column chromatography over slica gel using benzene ethyl- acetate(70:30) as eluent yielded the ylide(2) in smaller Chemistry and Materials Research                                                                www.iiste.org ISSN 2224- 3224 (Print) ISSN 2225- 0956 (Online) Vol 2, No.2, 2012  18 amounts along with another compound (4), m.p265-2700C , soluble in chloroform and a light brown coloured compound (5) in good yields. It was solouble in chloroform and did not melt upto 3550C.    Results and Discussion 1,3-indandione is an important member of class of 1,3-diketo compounds and literature is full of references giving its reactions with a variety of substrates yielding a wide range of compounds of pharmaceutical interest. Its reaction with DMSO-acetic anhydride has been found to result the corresponding ylid (2) in good yields 10 and a dimer (3) at room temperature.          (1)                                          (2)                                                             (3)           The pre heated 2:1 (v/v) mixture of DMSO and acetic anhydride has been found to furnish formaldehyde in situ which reacts with 1,3-dicarbonyl compounds to give their corresponding 2,2’-methylene- bis- derivatives.Interaction of this modified reagent with 1,3-indandione at waterbath temperature and workup of the reaction mixture followed by chromatography of the residue obtained,yielded surprisingly the ylide (2) in minimal amounts and an unusual trimer, m.p. 265-700C , did not respond positively when tested for the presence of sulphur  and was found to have the molecular formula C27H 14 O 6  on the basis of elemental analysis and mass spectrum showing molecular ion at m/z 434. This immediately suggested condensation of three molecules of 1,3-indandione without the involvement of formaldehyde, generated from the modified reagent. The pmr spectrum of this compound showed the presence of two methine protons and twelve aromatic protons at δ 2.69 and 7.3 to 8.5 respectively. Along with these, the infra red spectrum showing a broad carbonyl band centered at 1700cm-1 was also suggestive of the structure (4)      Chemistry and Materials Research                                                                www.iiste.org ISSN 2224- 3224 (Print) ISSN 2225- 0956 (Online) Vol 2, No.2, 2012  19                                                                                                                                                                                                                       (4) DMSO and acetic anhydride in the initial stages does produce (CH3)2S+-OAc  and O-Ac and the formation of dimer (3) and from it that of trimer (4) can be rationalized as depicted below                                                                                                                                                           The other novel compound (5), identified from this reaction was  methine- tris- 1,3-indandione . It did not respond positively  when tested for the presence of sulphur and could not melt up to 355oC, therefore its mass spectrum could not be recorded . However, on the basis of elemental analysis ,its molecular formula was found to be C28H14O5 which involves participation of three indandione residues and one carbon most likely from formaldehyde generated in situ in the formation of this compound. This molecular formula indicates that the trimer once formed might have suffered dehydration under reaction conditions to give the compound which can safely be assigned the structure (5)   3 4 Chemistry and Materials Research                                                                www.iiste.org ISSN 2224- 3224 (Print) ISSN 2225- 0956 (Online) Vol 2, No.2, 2012  20                                                                                                                                     (5)  The ir spectrum of this compound showing doublet of carbonyl band at 1750 and 1692 cm-1 is in full agreement with this structure. These bands can be assigned to the carbonyls of 2-substituted indandione residue and the two α,β –unsaturated five membered cyclic ketones respectively. Apart from this carbon -carbon double bond stretching band at 1652 cm-1 is also in favour of this structure.   The pmr spectrum of this compound shows a multiplet equivalent to 12 protons in the aromatic region between δ 6.69 to 8.75. Apart from this, it shows two doublets at δ 2.1 and 3.2 equivalent to one proton each. The doublet at up field value can be assigned to the proton which is doubly allylic and the other at downfield to the methine proton flanked on either side by carbonyl groups. Formation of methylene- bis-derivatives and cyclisations involving dehydration have been observed during reactions of β-diketones with DMSO-acetic anhydride but formation of methine- tris- derivative is being observed for the first time (scheme- I)         Chemistry and Materials Research                                                                www.iiste.org ISSN 2224- 3224 (Print) ISSN 2225- 0956 (Online) Vol 2, No.2, 2012  21       Chemistry and Materials Research                                                                www.iiste.org ISSN 2224- 3224 (Print) ISSN 2225- 0956 (Online) Vol 2, No.2, 2012  22  Spectral data (4)   1HNMR (δ)     (CDCl3/TFFA)                            2.69 (2H,s ,-CH ), 7.3 to 8.5 ( 12H,m,Ar-H) Ƴmax (KBr)                           1700 (broad), 1610,1450 and 1258 cm-1 Mass                            m/z 434 (M+), 301, 302, 288, 146. 105 ( base peak), 104, 77 and 76 (5)     1HNMR (δ)  (CDCl3)                                   2.1 (1H, d,-CH-),3.2 (1H,d,-CH-),6.69-8.75 (12H,m,Ar-H) Ƴmax (KBr )                                  1715, 1692 and 1652 cm-1 Acknowledgement   Authors are  highly thankful to RSIC  Punjab University Chandigarh India for recording IR, 1HNMR , Mass spectra  and elemental analysis. Chemistry and Materials Research                                                                www.iiste.org ISSN 2224- 3224 (Print) ISSN 2225- 0956 (Online) Vol 2, No.2, 2012  23 References  1. T. Durst, in advance in organic chemistry ; Methods and Results  vol. 6 (1969,) P: 285 2. W.W. Epstein, F.W; Sweat. Chem. Rev. 67, 247, (1967)    3. A. J. Mancuso and  D. Swern. Synthesis.  165 (1981). 4. R. F. Butterworth, S. Hanessian, Synthesis 1971, 70. 5. J.G. Moffat, in oxidation, vol. 2. R. L. Augustine, D. J. Trecker, Eds. Marcel Dekker. Inc. Newyork                                         6. 1971, P.1. 7. M. S. Newman, C.C. David. J. Org. Chem. 32,66, (1967) 8. R. J. Wikhom and H. W. moore, J. Am. Chem. Soc.94,6152, (1972) 9. 8)  K. Z. Khan. N. Minhaj. K. Tasneem. A. Zaman and F. M. Dean. J. Chem. Soc. Perkin. Trans-I.    841. (1983) 10. K. Z. Khan . K. Tasneem, M. Rehman, S. Prakash and A. Zaman Ind.j.Chem.,Sect.B.,42-46,  1985 11. A Hochrmer and F. 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Synthesis of Unusual Trimers in 1,3-Indandione

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Synthesis of Unusual Trimers in 1,3-Indandione

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