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Synthesis and X-ray structures of amidinate, oxoamidate, and thioamidate complexes of boron
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Synthesis and X-ray structures of amidinate, oxoamidate, and thioamidate complexes of boron
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Journal Article
Synthesis and X-ray structures of amidinate, oxoamidate, and thioamidate complexes of boron
2000
Overview
The reactions of PhBCl
2
with Li[CE(N
t
Bu)(
n
Bu)] or Li[CS(N
t
Bu)(NH
t
Bu)] (1:1 molar ratio) in toluene at 23°C produced the heterocycles Ph(Cl)B( -N
t
Bu)( -E)C(
n
Bu) (
1a
, E = N
t
Bu;
1b
, E = O;
1c
, E = S) or Ph(Cl)B( -N
t
Bu)( -S)C(NH
t
Bu) (
2
), which were characterized by
1
H,
11
B and
13
C NMR and by mass spectra. X-ray structural determinations revealed that
1a
,
1c
and
2
contain four-membered rings. In
2
the thioamidate ligand adopts an N,S bonding mode. Crystal data:
1a
, monoclinic, space group P2
1
, a = 8.816(3), b = 11.311(2), c = 10.168(3) Å, = 98.86(3)°, V = 1001.7(5) Å
3
, Z = 2, R = 0.042, and R
w
= 0.020;
1c
, monoclinic, space group P2
1
/n, a = 7.617(2), b = 11.200(1), c = 19.568(2), = 90.74(2)°, V = 1669.1(5) Å
3
, Z = 4, R = 0.046, and R
w
= 0.059;
2
, monoclinic, space group P2
1
/a, a = 11.357(2), b = 12.289(2), c = 12.620(3) Å, = 95.43(2)°, V = 1753.4(5) Å
3
, Z = 4, R = 0.043, and R
w
= 0.027.
Key words: boron, amidinate, oxoamidate, thioamidate, X-ray structures.
Publisher
NRC Research Press,Canadian Science Publishing NRC Research Press
Subject
