Facile syntheses, structural characterizations, and isomerization of disiloxane-1,3-diols

A Silylene–Borane Lewis Pair as a Tool for Trapping a Water Molecule: Silanol Formation and Dehydrogenation

“…The O−N distances of O1−N1 2.639(2) Å and O1−N2 2.621(2) Å are comparable, whereas the N1−H1 (1.72(3) Å) and O1−H2 (1.77(3) Å) separations suggest a deprotonation of the water molecule. These values are in good agreement with the intramolecular O−H⋅⋅⋅N contacts in the siloxandiol (Ar N 2 )Si(OH)O(OH)Si(Ar N 2 ) 5 …”

“…These values are in good agreementw itht he intramolecular OÀH···N contacts in the siloxandiol (Ar N 2 )Si(OH)O(OH)Si(Ar N 2 ) 5. [14] To characterize the bondingsituation of silanol 3a more precisely,i ts electronic structure and that of the additional conformer 3a-1,aswell as the structure 3a-2 exhibiting aprotonated silanol unit,h ave been investigated by DFT calculations (Figure S30 in the Supporting Information). In 3a-1 and 3a-2,t he amine/ammonium groups have been rotated as such that an interaction with the H 2 O/HO group is inhibited.…”

Synthesis of 6-, 7- and 8-membered cyclosiloxanes having multifunctional groups

“…Mass spectra were recorded on a low-resolution (Agilent Technologies GC/MS: 6890N, 5973N mass selective detector) EI mass spectrometer and a high-resolution (JEOL JMS-600W-Agilent 6890 Series) instrument. The preparations of disiloxane-1,3-diols 1 and 5 were reported in a previous paper [2,8].…”

Effect of proton donors on the intramolecular coordination C=O→Si-F in (acyloxymethyl)trifluorosilanes.Ab initio,DFT and FTIR study, QTAIM analysis

“…This is somewhat surprising, since the compounds of hypervalent silicon normally show enhanced reactivity in reactions with both electrophiles and nucleophiles . A hydrolysis reaction is not an exception; according to theoretical and experimental data, the pentacoordinated silicon compounds with different types of coordination (silatranes and O→Si chelates), including pentacoordinated fluorosilanes, react with water . N‐(Silylmethyl)phosphoramides R 2 P(O)NR′CH 2 SiMe 3–n Hal n having relatively weak coordination bond P=O→Si (2.1 < d SiO < 2.7 Å) give complexes with chloroform .…”