Klasinc L,Pop E,Trinajstic N,et al.The Oretical Studies of Positional Isomers Obtained by Annelation of Benzene and5-membered Ring Heterocyclics Containing Nitrogen,Oxygen,or Sulphur. Tetrahedron .Klasinc L,Pop E,Trinajstic N. The Oretical Studies of Positional Isomers Obtained by Annelation ...
Five-membered Rings with One Heteroatom and Fused Carbocyclic Derivatives Willy Friedrichsen, in Comprehensive Heterocyclic Chemistry II, 1996 2.07.3.6 Miscellaneous Syntheses The benzene ring of benzofurans can also be built up by elimination reactions from suitably substituted precursors. Treatment of (...
Palladium‐Catalyzed Bicyclization of 2‐Bromo‐1,6‐dienes and ‐1,6‐enynes to 5‐Membered‐Ring‐Annelated Vinylcyclopropane Derivatives Palladium-catalyzed cyclizations of the 2-bromo-1,6-diene 6 with an acetoxymethyl substituent on the bromoalkenyl moiety did not only lead to the expected.....
The six-membered C6 and C5O rings display chair conformations. The six-membered C3O3 ring containing the ether and peroxy functionalities has a distorted boat conformation, with a C#8212;O#8212;O#8212;C torsion angle of 42.6#8197;(1)#176; for the peroxy group. The seven-membered C6O ...
8-digermatricyclo[5.1.0.03,5]octa-1,3(5),6-triene) were synthesized as stable crystalline compounds by the reaction of the corresponding dilithiogermane Tbt(Dip)GeLi2 (8; Tbt = 2,4,6-tris[bis(trimethylsilyl)methyl]phenyl, Dip = 2,6-diisopropylphenyl) with 1,2,4,5-tetrabromobenzene....
The aromatic ring has been observed in interstellar space2,3, and aromatic structures, in general, are thought to pervade the interstellar medium4,5. The conjugated six-membered ring is also the building block of graphene6, a material with astonishing electronic properties. Benzene is the ...
With respect to the aliphatic planar five-membered ring (r.m.s. deviation = 0.011 Å) of the title compound, C15H13N3O2S, the phenyl ring is aligned at 6.9 (1)° and the phenylene ring at 2.4 (1)°, so that the three rings are nearly coplanar. The amino group has ...
which maximizes the force of attraction between the nuclei (positive) and the electrons (negative). Equally important is the number of π electrons, which, according to molecular orbital theory, must be equal to 4n+ 2, in whichn= 1, 2, 3, etc. For benzene with six π electrons,n= 1...
Nucleophilic replacement of the 2-chlorine atom has been established for the reaction of hexachlorobenzo-[b]-thiophen with lithium aluminium hydride; sodium benzenethiolate replaced a chlorine in the five membered ring; sodium isopropoxidc... King - 《Durham University》 被引量: 0发表: 1973年 ...
Five-membered ring aromatic compounds with a single sulfur (furan with sulfur replacing oxygen). transcription The copying of a gene (DNA) to yield RNA. transcriptional regulation Regulation of protein concentrations in a cell by effects on rates of transcription. ...