No abstract

Two new substituted disilenm, of the type IsRSi=SiIeR (Is = 2,4,6-triieopropylphenyl; R = Me& (0, t-Bu (2)), were synthesized by photolysis of the corresponding polyeilanes I~RSi(siMea)~ (3,4). Compound 1 is the fmt stable didene substituted with a non-firsbrow element. X-ray cryatal structures are reported for the E isomers for disilenes 1 and 2 and for tetraeilane 3. Both dieilenes are triclinic and have space group PI. The unit cell dimensions for (E)-1 are a = 10.046 (3) A, b = 10.221 (3) A, c = 10.307 (3) A, CY = 67.73 ( 2 ) O , B = 86.36 (3)O, and y = 84.47 (3)'. For (E)-2 a = 9.387 (2) A, b = 9.870 (3) A, c = 11.457 (3) A, CY = 76.54 (2)O, B = 76.16 (2)O, and = 64.54 (2)O. Tetrasilane 3 is monoclinic, having ml/n ae space group with cell dimensions a = 9.380 (3) i, b = 28.676 (9) & c = 10.862 (3) & and B = 97.47 (2)O. W i m I S ( X ) S~( S~M~~)~ (X = H, C1, F, 1-pyrrolyl) were synthesized and photolyzed at 254 nm.

No abstract

The synthesis of 2,2'-bis(bis(dimethyIamino)-phosphino)-3,3',5,5'-tetra-tert-butylbiphenyl (5) is described. It was extensively studied by ' H , 13C, and 3

Neutralization‐reionization mass spectrometry of silaanthracene radical cations, which are generated from the 9,10‐dihydro‐9‐silaanthracenes 1, 3, 8 and 11 under electron‐impact conditions, indicates that silaanthracenes are stable molecues in the gas phase. Flash pyrolysis of the starting compounds mentioned above also yields the silaanthracenes 2, 4, and 10, which may be isolated in an argon matrix at 15 K and exhibit characteristic UV spectra.