From tetrazoles via hydrazonoyl chlorides to 1,3,4-thiadiazole oligomers
摘要:
5-Substituted tetrazoles react rapidly with Appel salt 1 at room temperature to give hydrazonoyl chlorides (14) in high yield. 5-Aminotetrazole reacts further to give an extended bis-imine (6) which, with triphenylphosphine at room temperature, rapidly gives 1,3,4-thiadiazoles 15 and 17. The mono-imines 14 react similarly to give simpler thiadiazoles 18 in high yield. By repetition of the tetrazole formation and Appel salt-triphenylphosphine sequence, these 2-cyanothiadiazoles 18 are converted in high yield into thiadiazole dimers and trimers 21, n=1 and 2. These reactions are explained mechanistically. (C) 2000 Elsevier Science Ltd. All rights reserved.
From tetrazoles via hydrazonoyl chlorides to 1,3,4-thiadiazole oligomers
摘要:
5-Substituted tetrazoles react rapidly with Appel salt 1 at room temperature to give hydrazonoyl chlorides (14) in high yield. 5-Aminotetrazole reacts further to give an extended bis-imine (6) which, with triphenylphosphine at room temperature, rapidly gives 1,3,4-thiadiazoles 15 and 17. The mono-imines 14 react similarly to give simpler thiadiazoles 18 in high yield. By repetition of the tetrazole formation and Appel salt-triphenylphosphine sequence, these 2-cyanothiadiazoles 18 are converted in high yield into thiadiazole dimers and trimers 21, n=1 and 2. These reactions are explained mechanistically. (C) 2000 Elsevier Science Ltd. All rights reserved.
Conversion of tetrazoles into hydrazonoyl chlorides. Novel donor–dithiazolium interactions
作者:Charles W. Rees、Sivaprasad Sivadasan、Andrew J. P. White、David J. Williams
DOI:10.1039/b202211g
日期:2002.6.27
5-Substituted tetrazoles 13, readily prepared from RCN and aluminium azide, react rapidly with Appel salt 1 at room temperature to give hydrazonoyl chlorides 16 in high yield. 5-Aminotetrazole 4 reacts further to give the extended bis(iminodithiazole) 6 and a minor product 7. Mechanisms are proposed for these reactions (except for the formation of 7) which are supported by the smooth conversion of