摘要:

AbstractThe addition of equimolecular quantities of phosphonium salts to an aqueous sodium perborate solution (Na+PB−) greatly enhances he efficiency of Na+PB−as a reagene that destroys organophosphorus esters, such asp‐nitrophenyldiethyl phosphate or ethylp‐nitrophenyl methylphos

ISSN:1042-7163    

DOI:10.1002/hc.520010401

出版商:VCH Publishers, Inc.    

年代:1990

数据来源: WILEY

摘要:

AbstractThe first photochromic thioanhydride, (E,E)‐2,3‐dibenzylidenesuccinic thioanhydride (1b), was synthesized. Irradiation of (1b) in benzene, dichloromethane, or chloroform gives isomerization and cyclization products similar to those obtained for the anhydride analogue (1a). The crystal structure of (1b) was determined (X‐rays) and compared to the structures of the anhydridge (1a) andN‐phenylimide (1c).1H and13C NMR spectra were recorded, and the electron charge densities of the carbon atoms were calculated with AM1. These results are discussed and compared with those for the compounds1a–1c. The thioanhydride (1b) ring is much more twisted than either the anhydridge (1a) or the imide (1c) rings. The linear relationship between the13C NMR chemical shifts and the electron charge density on the given atom has been investigated. The C(carbonyl) and C(α) carbon atoms of1bwere found to be greatly deshielded relative to the corresponding atoms in1aand1b. The increase in corresponding atoms in1aand1b. The increase in sensitivity toward cyclization of the thioanhydridge (1b) is attributed to the marked change in the charge distribution.Crystal data. Thioanhydride (1b): space group P21/cwith a = 12.956(3) Å, b = 14.843(6) Å, c = 7.512(6) Å, β = 98.05(2)°, Rw = 0.08

ISSN:1042-7163    

DOI:10.1002/hc.520010402

出版商:VCH Publishers, Inc.    

年代:1990

数据来源: WILEY

摘要:

AbstractAluminum(III) complexes ofS‐methylisopropylidenehydrazinecarbodithioate have been synthesized and characterized by1H,13C and27Al NM

ISSN:1042-7163    

DOI:10.1002/hc.520010403

出版商:VCH Publishers, Inc.    

年代:1990

数据来源: WILEY