Reactions of O,O-dialkyldithiophosphoric acids with non-activated α-olefins

Electrophilic addition reactions of O,O-dialkyldithiophosphoric acids to non-activated α-olefins proceeding in accordance with the Markovnikov's rule were studied. In the absence of a catalyst these reactions occur very slowly to give the products in low yields, while Lewis acid as a catalyst can greatly accelerate the reaction and increase the conversion in the Ad E-processes. A similar acceleration of the addition processes and an increase in the reaction product yield occur at the action of ultrasound on the reaction medium. © 2012 Pleiades Publishing, Ltd.

Reactions of 2,4-diaryl 1,3,2,4-dithiadiphosphetane-2,4- disulfides with disilylated resorcinols

© 2016 Taylor & Francis Bis(trimethylsilyl) esters of bisaryldithiophosphonic acids were obtained in 70–81% yields by the reactions of 2,4-diaryl 1,3,2,4-dithiadiphospheta ne-2,4-disulfides with 1,3-bis(trimethylsilyloxy)benzene and 2-methyl 1,3-bis(trimethylsilyloxy)benzene

Improving upset forgingtube billettechnology to avoid the clamp defect on semi-axle housingforging

© Published under licence by IOP Publishing Ltd. Upset forging with heating on the limited site is simulated. Advantage of type-setting conversion formation method application with a punch in the form of a cone is confirmed

Research of influence of geometrical parameters of a stamp engraving of setting transitions at setting of semi finished pipe products to receiving defect-free products

The cause of a pipe clip during the setting of the pipe is determined on the basis of modeling. The method, which excludes the formation of a defect in a semi finished product by changing the configuration of the setting transition, is developed

Surface quality assurance of ring gear during precision stamping of gearwheels

© Published under licence by IOP Publishing Ltd. The article highlights the main factors, defining the surface quality of ring gear during hot bulk precision stamping. It offers enhanced techniques of surface quality of stamped ring gear

Reactions of 2,4-diaryl 1,3,2,4-dithiadiphosphetane-2,4-disulfides with disilylated resorcinols

© 2016 Taylor and Francis.Bis(trimethylsilyl) esters of bisaryldithiophosphonic acids were obtained in 70-81% yields by the reactions of 2,4-diaryl 1,3,2,4-dithiadiphospheta ne-2,4-disulfides with 1,3-bis(trimethylsilyloxy)benzene and 2-methyl 1,3-bis(trimethylsilyloxy)benzene

Dithiophosphorylation of racemic and enantiomerically pure trimethyl-N-(1-phenylethyl)silanamine

Trimethylsilyl P-aryl-N-[(RS)-, (S)-(-)-, and (R)-(+)-(1-phenylethyl)] phosphonamidodithioates were synthesized by reactions of 2,4-diaryl-1,3, 2λ5,4λ5-dithiadiphosphetane 2,4-disulfides with racemic and and enantiomerically pure trimethyl-N-(1-phenylethyl) silanamine. © 2013 Pleiades Publishing, Ltd

Dithiophosphorylation of cyclic monoterpenes

New data are presented for the synthesizing terpene esters of dithiophosphoric acids and their structure. Copyright © Taylor & Francis Group, LLC

Optically active s-esters of dithiophosphoric acid on the basis of (1S)-endo-(-)-borneol

The ammonium salt of optically active dithiophosphoric acid obtained by the reaction of tetraphosphorus decasulfide with (1S)-endo-(-)-borneol reacts with benzoyl chloride, methyl chloroacetate and epichlorohydrin to form novel dithiophosphate S-esters. © 2013 Wiley Periodicals, Inc

Phosphorylation and thiophosphorylation of oligomeric polyesterpolyols of boltorn H20, H30, AND H40

Dialkyl phosphate derivatives of Boltorn H20, H30, and H40 were prepared by the use of ultrasound irradiation in the substitution reactions of the polyesterpolyols with dialkyl chlorophosphates. Unsaturated polyacrylates were obtained by the reactions of Boltorn H20, H30, and H40 with acryloyl and methacryloyl chlorides. The reactions of these polyacrylate esters with O,O-dialkyl dithiophosphoric acids in the presence of Lewis acid catalysts have brought about the formation of the corresponding dithiophosphates. Copyright © Taylor & Francis Group, LLC