ISSN:
0009-2940
Keywords:
cis-2-Boryl-1-silylalkenes
;
Hydroxy-triorgano-borates
;
Cyclization
;
Organoboron-silicon heterocycles
;
Chemistry
;
Inorganic Chemistry
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
Organosubstituted Potassium 2,5-Dihydro-1,2,5-oxasilaboratolates from cis-2-Boryl-1-silylalkenes with Potassium HydroxideThe compounds (E)-CH3ElIV(R2)2CR3=C(C2H5)B(C2H5)2 [R2,2,3 = CH3: 1a; R2 = C2H5, R2,3 = CH3: 1b; R2,2 = C6H5, R3 = CH3: 1c; R2,2 = CH3, R3 = C6H5: 1d; R2,2 = CH3, R3 = c-C6H11: 1e] add KOH in THF at - 20°C to form the pure solid 1:1 adducts KOH-1ElIV with ElIV = Si, Sn, and Pb. Above ≥0°C compounds KOH-1Si liberate quantitatively R2H to give the potassium salts of the cyclic anions K-2a to K-2e. With Me4NCl or Me3NHCl the corresponding salts Me4N-2 or Me3NH-2 are obtained from K-2. Above ≍80°C KOH-1aGe and KOH-1aSn eliminate gas (CH4, C2H6) with formation of mixtures. The compounds KOH-1ElIV and K-2Si are characterized by multi-NMR spectroscopy (1H, 11B, 13C, 17O, 29Si, 119Sn, 207Pb), and the NMR data of KOH-1aElIV are compared to the data of the compounds .
Additional Material:
4 Tab.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/cber.19901230607
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