Phenylgermaniumpyridine-2-olate PhGe(pyO)3 (compound 1Ge) and CuCl react with the formation of heteronuclear complex Ph(pyO)Ge(μ2-pyO)2CuCl (2Ge’) rather than forming expected compound PhGe(μ2-pyO)3CuCl (2Ge). Single-point calculations (at B2T-PLYP level) optimized molecular structures confirmed relative stability isomer 2Ge’ over 2Ge and, for related silicon congeners, 2Si 2Si’. Decomposition ...

The first silenolates with exocyclic structures [(Me3Si)2Si(Si2Me4)2SiC(R)O]-K+ (2a: R = 1-adamantyl; 2b: mesityl; 2c: o-tolyl) were synthesized by the reaction of the corresponding acylcyclohexasilanes 1a-c with KOtBu. NMR spectroscopy and single-crystal X-ray diffraction analysis suggest that the aryl-substituted silenolates 2b,c exhibit increased character of functionalized silenes as compar...

A–1 We proceed by induction, with base case 1= 2030. Suppose all integers less than n− 1 can be represented. If n is even, then we can take a representation of n/2 and multiply each term by 2 to obtain a representation of n. If n is odd, put m = blog3 nc, so that 3m ≤ n < 3m+1. If 3m = n, we are done. Otherwise, choose a representation (n−3m)/2= s1+ · · ·+sk in the desired form. Then n = 3m +2s...

On account of our interest in P4 activation by phosphenium ion insertion into P-P bonds we have developed synthetic routes to bicyclic N-P-Si-heterocycle 7 and probed its reactivity towards GaCl3 and P4. A GaCl3-induced rearrangement of 7 leads to the in situ formation of spirocyclic, Si-centered phosphenium ions. Their insertion into P-P bonds of one or two P4 tetrahedra yields polyphosphorus ...

The chemistry of N-organosilylalkyl-substituted heterocyclic bases (thymine, adenine and cytosine) is described, covering the structures of model compounds, the synthesis of substituted oligo-siloxanes and a preliminary report of the synthesis of a poly(organosiloxane) with pendant N-alkyl(heterocycle) functionalities. N-Alkenylthymines CH2=CH(CH2)(n)T (T = thymine, n = 1 (1), 2 (2), 3 (3)) hav...

Chelating phosphines incorporating ethoxysilane functions for immobilizations have been synthesized and fully characterized. (EtO)Si(CH2PPh2)3, (EtO)2Si(CH2PPh2)2, and Si(CH2PPh2)4 could be prepared in high yields from cheap starting materials. The ethoxysilanes, as well as a Pd complex thereof have been characterized by X-ray structures, and immobilized on silica. The success of the immobiliza...

PURPOSE The aim of this study was to investigate the stress distribution of 2-short implants (2SIs) installed in a severely atrophic maxillary molar site. MATERIALS AND METHODS Three different diameters of internal connection implants were modeled: narrow platform (NP), regular platform (RP), and wide platform (WP). The maxillary first molars were restored with one implant or two short implan...

Solubilized ~2sI-¢o conotoxin MVIIC receptors from rat cerebellum were immunoprecipitated by antibodies directed against the calcium channel ~ I A subunit. Anti-alA antibodies recognized a 240-220, 180 and 160 kDa proteins in immunoblots of cerebellar membranes. Disuccinimidyl suberate cross-linked ~2sI-~o conotoxin MVIIC to an ct26-1ike 200-180 kDa subunit, which migrated at 150-140 kDa after ...

The structure, bonding and reactivity of 2-adamantylidene and its heavier group-14 analogues, 2X (X10H14, X = C-Sn), have been studied at the M06/def2-TZVPP//BP86/def2-TZVPP level of theory. 2-Adamantylidene and its heavier analogues, 2X, have a singlet ground state, where the carbene and silylene bridges in 2C and 2Si are bent similarly to the foiled-type carbenes. The bending of the carbene a...