摘要:

AbstractThe geometric structure of trifluoromethyl vinyl sulfide, CF3SC(H)CH2, was determined by gas electron diffraction and ab initio calculations (HF/3‐21G*and MP2/6‐31G*). A single conformer with a dihedral angle ϕ(CC–S–C) = 129(4)° is present. The conformational properties are compared to those of the parent compound, CH3SC(H)CH2, and of the perfluorinated speci

ISSN:0009-2940    

DOI:10.1002/cber.19971300122

出版商:WILEY‐VCH Verlag    

年代:1997

数据来源: WILEY

摘要:

AbstractReaction of P4in THF or DME with 2 R*Na (R*= SitBu3) at –78°C leads quantitatively to deep red THF or DME adducts of R*NaP–PP–PNaR*(3). According to31P NMR, the P4skeleton3iscis‐configurated. On the other hand, reaction of P4in TBME with 2 R*Na at ‐78°C leads quantitatively to (R*NaP)4(4), a [2+2] cycloadduct of3, the Na4P8skeleton of which according to X‐ray structure analysis forms a double cube with four P atoms in the second layer and two P and two Na atoms in alternating positions in the first and in the third layer (the Na atoms are coordinated with donors). By resolving the THF adduct3in TBME (the TBME adduct of4in THF) the compound4(the compound3) is rapidly formed under reversal of the P–PP–P configuration by way of [2+2] cycloaddition (by way of [2+2]cycloreversion).3and4are sensitive to oxidation and to protolysis. With TCNE,3is oxidized to R*2P4(bicyclic P4skeleton), with CF3SO3H,3may be transformed into R*3P5Na2X 4 THF o

ISSN:0009-2940    

DOI:10.1002/cber.19971300123

出版商:WILEY‐VCH Verlag    

年代:1997

数据来源: WILEY

摘要:

AbstractThe metalation of bis(diphenylphosphanyl)amine [HN‐(PPh2)2,1with KOtBu at 95°C in toluene affords a pale yellow precipitate of potassium bis(diphenylphosphanyl)amide (3a). On addition of liquidN,N,N′,N”︁,N”︁‐pentamethyldiethylenetriamine (PMDTA,4) the precipitate dissolves in toluene at 115°C to give a yellow solution, from which yellow‐green blocks of [(Ph2P)2NK·PMDTA] (3b) are obtained. X‐ray analysis reveals that the coordination sphere of potassium consists of the chelating triamine ligand and [N(PPh2)2]−as N‐donor as well as η1and η2C‐donor with two phenyl fragments. No phosphorus coordinati

ISSN:0009-2940    

DOI:10.1002/cber.19971300124

出版商:WILEY‐VCH Verlag    

年代:1997

数据来源: WILEY

ISSN:0009-2940    

DOI:10.1002/cber.19971300101

出版商:WILEY‐VCH Verlag    

年代:1997

数据来源: WILEY