ISSN:
0009-2940
Keywords:
PC cleavage
;
P,P′-Bi(1,3,2,4-diphosphadiboretane), 3,3′-di-tert-butyl-2,2′,4,4′-tetrakis-(tetramethylpiperidino)-
;
Chemistry
;
Inorganic Chemistry
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
Photolysis of the 1,3,2,4-diphosphadiboretane (tBuPBtmp)2 (1) in dilute toluene solution yields the bicyclic diphosphadiboretane 2. In concentrated toluene solution or in hexane, however, the P,P′-connected bi(diphosphadiboretane) 4 is also formed implying that the radical [tBuP(Btmp)2P] 3 is the first photolysis product. On further photolysis, 3 and 4 are converted into bicyclic 2 as the final product. Reduction of 4 with sodium-potassium alloy followed by silylation with Me3-SiCl leads to the 1,3,2,4-diphosphadiboretanes (tmpBP-SiMe3)2 and [HP(Btmp)2PSiMe3]2. In contrast to many 1,3,2,4-diboretanes, 4 in the absence of photon or thermal promotion does not react with Cr(CO)5 · THF, Fe2(CO)9, or Pd(PPh3)4. However, a mixture of Cr(CO)5 · THF and 4 on photolysis gives the known complex (tmpBP)2 · 2 Cr(CO)5.
Additional Material:
1 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/cber.19961290513
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