Representations of finite universal algebras in finite semigroups

An answer is given to the question of what conditions must be imposed on a signature in order that every finite algebra with this signature can be represented in the Mal'tsev-Cohn sense in a finite semigroup.Translated from Matematicheskie Zametki, Vol. 9, No. 3, pp. 285–290, March, 1971.The author wishes to thank A. G. Kurosh and Yu. K. Rebane for directing this work.     

Di- and tri(2-pyron-6-yl)arenes

Condensation of di- and triacetylarenes with 1,1,1,3-tetrachloro-3-alkoxypropanes or ,-dichloroacrolein in acidic media gave a number of (dichloropentadienyl)- and tris (dichloropentadienyl)-substituted aryl ketones, which, in the case of acetic acid in the presence of phosphoric acid, are converted to the corresponding di- and tri(2-pyron-6-yl)arenes. It was observed that nitric acid has an oxidation effect on 2-pyrones.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 7, pp. 897–901, July, 1977.     

Asymmetric Ir-catalyzed hydrogenation of 4-R-1,3-dihydro-2H-1,5-benzodiazepin-2-ones using a novel phosphoramidite ligand

Russian Chemical Bulletin - A novel chiral phosphoramidite ligand, (Sa)-2-[N-ethyl-N-(1-naphthylmethyl)amino]-dinaphtho[2,1-d:1´,2´-f][1,3,2]dioxaphosphepane, was obtained and tested in...