12 research outputs found
INCREASE OF EFFICIENCY OF FUNCTIONING OF SYSTEM OF GATHERING AND HANDLING OF THE MARKETING INFORMATION
Ring-expansion of an Aziridinone to a Hexahydrotriazine Through the Agency of a Novel Rearrangement
Reaction of 1,3-di-t,'rt-bu~.laziridinonc (la) and similar aziridinones with thiosemicarbazide affords, as one of the products, a compound devoid of sulfur, vie., a substituted N- aminoimidazolidinone (3a) by selective cleavage of the acyl-nitrogcn bond. Compound 3a undergoes a novel, acid-catalyzed rearrangement to a 3-imino-hexahydro-1,2,4-tri~in-6-one (7a), which can also be obtained ~' treatment of la with hydrazinc followed by BrCN. involving again selective cleavage of the
acyl-nitrogen bond
Regioselectivity in nucleophilic ring-opening of aziridinones
The proportions of products derived from competing modes
of ring-opening of 1,3-di-tert-butylaziridinone and similar
aziridinones by a variety of nitrogen, oxygen, sulfur and
halogen nucleophiles do not agree with simple guidelines
postulated in the literature for these types of aziridinones
Application of Electron Spin Resonance Spectroscopy to Problems of Structure and Conformation. VIII. Semidiones Derived from 9-Methyldecalones and 10-Methyl Steroidal Ketones. Assignment of Structure to A-Ring Steroidal Ketones 1
Crystal structure of 1,5-di-tert-butyl-2-iminoimidazolidin-4-one, C11H21N3O
Source of material : The title compound was prepared by treatment of 1,3-di-tórí-butylaziridinone with cyanamide, followed by trituration with ether as described in ref. 1
Crystal structure of 1,5-di-tert-butyl-2-(methylamino)-2-imidazolin-4-one monohydrate, C12H24N3O1.5
Source of nnaterial: The title compound was prepared by treatment of 1,3-di-fert-butylaziridinone with methylthiourea, followed by chromatography on silica gel, and crystallization from toluenehexane as reported in ref. 1
Synthesis and X-ray Analysis of (RS)-N-tert-butyl-2-anilino- 3,3-dimethylbutanamide
The crystal and molecular structure of (RS)-N-Tert-butyl-2-anilino-3,3-dirnethylbutanamide, a derivative of an amino acid that was obtained by highly selective cleavage of 1,3-di-tert-butylaziridinone by aniline, is described. The racemic mixture of the amide crystallizes in the space grot)p P 2in with four molecules per unit cell. Crystal Data: a - 10.483(2) A, h - 6.206(I) A, c = 24.767(5) A, [3 - 90.39(3), V = 1611.5(6) A ~, R(F)[I > 2r = 0.0679, wR(F 2) [1 > 2or(l)] = 0. 1148
Elucidation of Fragmentation Pathways for the Collision-Induced Dissociation of the Binary Ag(I) Complex with Phenylalanine
Preparation of Substituted Imidazolidinones and Hydantoins by Ring-Expansion of Aziridinones
Reaction of 1,3-di-tert-butylaziridinone and other di-tert-alkylaziridinones with cyanamides produces an imidazolidinone (3 or 6) bearing the tert-alkyl substituents at positions 1 and 5 only, by selective cleavage of the acyl-nitrogen bond. Treatment of the product from the unsubstituted cyanamide (3) with HNO 2 furnishes the corresponding hydantoin (5), whereas treatment with alkyl halides and base affords another imidazolidinone (7