ISSN:
0009-2940
Schlagwort(e):
Hydroboration of 1-alkinylsilanes
;
Ethyldiboranes(6)
;
Alkyl substituent exchanges
;
BH-borane-catalysed
;
1,4-Diborinanes, trimethylsilyl-substituted, isomers of
;
Lewisbase - 1,4-Diborinanes
;
Chemistry
;
Inorganic Chemistry
Quelle:
Wiley InterScience Backfile Collection 1832-2000
Thema:
Chemie und Pharmazie
Notizen:
Trimethylsilylated 1,4-Diborinanes and 1,3-Diborolanes - Formation, Isomer Separation, and CharacterisationMe3SiC≡CH (A) reacts with excess (Et2BH)2 via the compounds 1, 1′ and 2, 2′ to yield a mixture of four regio- and stereoisomeric 1,4-diethyl-2,5(6)-bis(trimethylsilyl)-1,4-diborinanes (3a-d) and minor amounts of 1,3-diethyl-2-methyltrans-2,5-bis(trimethylsilyl)-1,3-diborolane (4a). The 2,5-ee-(Me3Si)2 compound 3d is isolated as the adduct 3d(Pic)2 (X-ray structure analysis), from which pure 3d is obtained with Et2O-BF3. 3d and Me3P form equilibria of the 1:1 and 1:2 addition compounds 3d(Me3P)n (n = 1,2) at room temperature. Me3SiC≡CMe (B) reacts with (Et2BH)2 via 5 to give 6-10, and Me3SiC≡CSiMe3 (C) reacts with (Et2BH)2 to form the ring compounds 12 and 13 via the presumably threo/erythro mixture of 11a and b.
Zusätzliches Material:
3 Ill.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1002/cber.19941270504
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