In:
Zeitschrift für Naturforschung B, Walter de Gruyter GmbH, Vol. 47, No. 10 ( 1992-10-1), p. 1370-1376
Abstract:
The zwitterionic λ 5 -spirosilicates bis[1,2-benzenediolato(2–)][2-(dimethylammonio)-phenyl] silicate (4) and bis [2,3-naphthalenediolato(2–)][2-(dimethylammonio)phenyl] silicate (5; isolated as 5 · ½CH 3 CN) were synthesized and the crystal structure of 4 was studied by X-ray diffraction. 4 was prepared by reaction of [2-(dimethylamino)phenyl]trimethoxysilane (7) or bis[2-(dimethylamino)phenyl] dimethoxysilane (8) with 1,2-dihydroxybenzene in acetonitrile at room temperature. 5 was synthesized analogously by reaction of 7 or 8 with 2,3-dihydroxynaphthalene. The silanes 7 and 8 were obtained by reaction of tetramethoxysilane (6) with [2-(dimethylamino)phenyl]lithium. The reactions 8 → 4 and 8 → 5 involve a remarkable Si–C cleavage leading to the formation of (dimethylamino)benzene. The pentacoordinate silicon atoms of 4 and 5 are surrounded by four oxygen atoms and one sp 2 hybridized carbon atom. The coordination polyhedron of 4 can be described as a distorted square pyramid, the carbon atom being in the apical position (the structure is distorted by 69,1 % from the trigonal bipyramid towards the square pyramid). In the crystal, 4 forms an intramolecular N-H···O hydrogen bond.
Type of Medium:
Online Resource
ISSN:
1865-7117
,
0932-0776
DOI:
10.1515/znb-1992-1006
Language:
English
Publisher:
Walter de Gruyter GmbH
Publication Date:
1992
detail.hit.zdb_id:
2078109-X
detail.hit.zdb_id:
124635-5