The invention concerns tetrahydrofuran/but-2-ine-1,4-diol copolymers containing C-C triple bonds, the copolymers having a mean molecular weight Mn of 500 to 3,500 Daltons and containing 0.5 to 3 moles of triple bonds per mole of copolymer, as well as blends of these copolymers with poly...
The C≡C triple bond of 7 was inserted into the AlP bonds of the heterocycles upon warming to give the bicyclic compound 13. A similar compound (12) was directly formed when the bisalkyne 4 was treated with dineopentylaluminum hydride. Their molecular structures show the annulated four- (...
To predict potentially stable molecules with Si(triple bond)C triple bonding, theoretical calculations at the B3LYP/ 6-311G(d) and CCSD(T)/6-311G(2df) (single-point) levels were employed to study the structures, energetics, and isomerization of various SiCN2 isomers. A schematic potential ...
After the generation of a second Ba–C bond, the subsequent intramolecular nucleophilic aromatic substitution would occur, generating the species D. Next, D converted to the naphthylbarium species E via C–H bond cleavage, while the BaI2 and BaH2 were removed from D. Iodination of E could 6...
In this regard, the use of transition-metal catalysts normalizes the pre-existing barrier to prevail a selective C–C bond formation Fig. 1. A suitably designed directing group can coordinate with the transition metal to form a cyclometallated intermediate, thus reaching in the vicinity of the...
Novel Mode of C-C Bond Cleavage of Norbornadiene on a Dinuclear Ruthenium Complex We are grateful to the Kanto Chemical Co., Inc., for a generous gift of pentamethylcyclopentadiene Y OhkiH SuzukiAngew Chem Int Ed EnglOhki Y,Suzuki H.Novel mode of C-C bond cleavage of norbornadiene on...
Room-temperature C-H bond activation of methane by bare [P(4)O(10)](*+) No need for a metal : A combination of mass spectrometry and computational studies (density functional theory and coupled-cluster methods) shows that [P4O1... N Dietl,M Engeser,H Schwarz - 《Angewandte Chemie》...
C≡N triple bond cleavage via trans-membrane hydrogenation. Chem. Catal. https://doi.org/10.1016/j.checat.2022.02.005 (2022). Article PubMed Google Scholar Brotzel, F., Chu, Y. C. & Mayr, H. Nucleophilicities of primary and secondary amines in water. J. Org. Chem. 72, 3679–...
It is confirmed that the excellent designed regioselectivity for the C–C triple bond insertion is induced by the coordination of the carbonyl group in the directing carbonate group as well as the steric effect of the tertiary O-linked carbon atom. When an optically active carbonate was used, ...
1[大学]有机化学问题一道CH3CN + LDA + cyclohexanone = ? LDA是一种碱,CN之间是triple-bond。网上应该都有。 我的结果是6个C的环。一个C连=O,旁边的一个C连-C-CN。结果却不对,求解。不好意思哈,还是不太明白你说的第3步...cyclohexanone便成cyclohexene了?ene or ane?还有H2C=C=N- N上面有2个...