In:
Zeitschrift für Naturforschung B, Walter de Gruyter GmbH, Vol. 52, No. 1 ( 1997-1-1), p. 1-8
Abstract:
Bis[bis(dimethylamino)phosphino]acetylene (2a) and two molecules of dimethyl- and diethyl-acetylenedicarboxylate (1a /1b ) react in a criss-cross-cycloaddition to yield 1λ 5 ,4λ 5 - diphosphapentalenes (3), which react further with 1 to yield a 1λ 5 ,4λ 5 -diphosphaazulenes (5). A mechanism of both reactions is proposed. The reaction of 1λ 5 ,4λ 5 -diphosphaazulene with 1a at high pressure yields 1,1,4,4-tetrakis(dimethylamino)-3,5,6,7,8 -pentakis(methoxycarbonyl)- 2-[1,2,2tris(methoxycarbonyl)ethenyl]-1λ 5 ,4λ 5 -diphosphaazulene (7). The reaction of bis(diphenylphosphino) acetylene (2c) with 1a yields 1,5a-dihydro-1-methoxy-(1-methoxycarbonylethinyl)- 3,3,7,7-tetraphenyl)-2-oxa-3λ 5 ,7λ 5 -diphosphacyclopenta[1,2,3-c,d]azulene- 4,5,5a,6,8,9-hexakis(methoxycarbonyl) (9) and 4-(diphenylphosphoryl)-5-[1,2-bis-(methoxycarbonyl)- ethylidene] -1λ 5 -phosphol-2,3-bis(methoxycarbonyl) (10)
Type of Medium:
Online Resource
ISSN:
1865-7117
,
0932-0776
DOI:
10.1515/znb-1997-0102
Language:
English
Publisher:
Walter de Gruyter GmbH
Publication Date:
1997
detail.hit.zdb_id:
2078109-X
detail.hit.zdb_id:
124635-5
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