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Reactivity and crystal structure of 1,2:3,4:5,6-Tri-O-isopropylidene-D-gluconolactone

100%

Jarosz S. , Ciunik Z.

tom Vol. 72, nr 7

1182-1190

1,2:3,4,5,6-Tri-O-isopropylidene-D-gluconate (1) undergoes the beta-elimination reaction in the presence of LDA to afford 3-deoxy-1,2:5,6-di-O-isopropylidene-D-erythro-hex-3-enolactone (6). Attempts to prepare the phosphonate 4 by reaction of 1 with dimethyl methylphosphonate in the presence of LDA failed; only elimination product 6 was isolated from the reaction mixture. The sugar phosphonate 8 (protected form of 4) was prepared from methyl 2-O-benzyl-3,4:5,6-di-O-isopropylidene gluconate (7) by reaction with (-)CH2P(O)(OMe)2. The crystal structure of 1 is reported.

Coordination behaviour of N,N'-diallylpiperazinium(+2) and N-allylhexamethylenetetraminium in their crystalline pi-complexes with ionic copper(I) salts

71%

Shkurenko O. , Kinzhybalo V. , Lis T. , Ciunik Z. , Myskiv M.

tom Vol. 23, No. 3

743--756

This brief review discusses the coordination behaviour of π-coordinated copper(I) in the structures of [Cu2(μ-dapp)(NH2SO3)4]·2H2O (1), [C4H12N2][Cu2(μ-dapp)(NH2SO3)6]·2H2O (2), [Cu2(μ-dapp)(H2O)6] (SiF6)2·2H2O (3), [Cu2(μ-dapp)(NO3)4(H2O)2]·2H2O (4), [Cu(μ-ahmta)(NO3)(H2O)](NO3)·H2O (5), and [Cu(μ-ahmta)(H2O)2](BF4)2·H2O (6) complexes (dapp = N,N′-diallylpiperazinium(2+), ahmta = N-allylhexamethylenetetraminium), obtained as single crystals by means of an alternating current electrochemical technique. The above π-complexes are formed respectively by CuSO3NH2, Cu2SiF6, CuNO3, and CuBF4 salts, unknown in a free state.