Diels-alder reaction of 1-methylcycloprop-2-ene-1-carbonitrile with methyl 2-oxo-2H-pyran-5-carboxylate

The Diels-Alder reaction of 1-methylcycloprop-2-ene-1-carbonitrile and coumalic acid methyl ester (methyl 2-oxo-2H-pyran-5-carboxylate) gave a 2:1 adduct with endo-syn configuration of both cyclopropane fragments, which was established by X-ray analysis. According to the ¹H NMR data, the reaction involves intermediate formation of decarboxylated 1:1 adduct having a cycloheptatriene structure; its isomerization into the corresponding caradiene, followed by addition of the second dienophile molecule, was confirmed by quantum-chemical calculations.     

Essential Oil from the Aerial Part of Saponaria griffithiana and S. officinalis

Chemistry of Natural Compounds -     

General procedure for the synthesis of ortho-vinylbenzyl-substituted amines, ethers, and sulfides

A convenient procedure has been proposed for the synthesis ortho-vinylbenzyl-substituted ethers, amines, and sulfides via reaction of o-(2-bromoethyl)benzyl bromide with various nucleophiles.     

Synthesis of 3,4-dihydroxyphenyl-containing polymeric materials from 1,2-polybutadiene and eugenol via thiol—ene addition

Russian Chemical Bulletin - In a search for routes to new promising adhesive materials, 3,4-dihydroxyphenyl groups were introduced for the first time into syndiotactic polybutadiene (1,2-unit...     

Crystal and molecular structures of 4-hydroxy-5-nitrophenyl cyclohexyl ketone

Technical Physics Institute, Tadzhik Academy of Sciences. Translated from Zhurnal Strukturnoi Khimii, Vol. 31, No. 1, pp. 195–198, January–February, 1990.     

Latent ruthenium carbene complexes with six-membered N- and S-chelate rings

New ruthenium carbene complexes with chelating N- and S-benzylidene ligands were synthesized by the reactions of second- and third-generation Grubbs catalysts with ortho-vinylbenzyl-substituted amines or sulfides. These complexes were shown to exhibit catalytic activity in ring-opening metathesis polymerization and ring-closing metathesis.