Apart from neutrals, four anions (C4H−, C6H−, C8H−, and C10H−) and two cations (C3H+and C5H+) have also been identified in TMC-1. The anions could form by the electron attachment for the neutral species; the cases of C4H−and C5H−are shown in Fig.1. The anions...
Open-chain alkenes with one double bond have the general formula CnH2n, where n equals the number of carbon atoms. Open-chain alkynes with one triple bond have the general formula CnH2n –2. Like the alkanes and other hydrocarbons, they are insoluble in water and are flammable. The most...
An alternative procedure involves the isomerization of internal alkynes to the terminal derivative, which can be oxidized directly to the carboxylic acid [22] or phosphoranes [23], i.e. alkyltriphenylphosphonium bromides with lithium hexamethyldisilazide, reacted with ω-oxo esters to give the ...
Hydrocarbons are named using a prefix based on the number of carbons in the chain and a suffix indicating the types of bonds contained within them. Single, double, and triple bonds are called alkanes, alkenes, and alkynes respectively. For the compound "ethane," which is a gas, the prefix ...
Pd/C–Cu catalyzed coupling reactions of 3-iodo-1 H-quinolin-4-ones with a variety of terminal alkynes afforded furo[3,2- c]quinolines regioselectively in ... S Venkataraman,DK Barange,M Pal - 《Cheminform》 被引量: 54发表: 2007年 Synthesis of 2-alkoxy(aroxy)-3-substituted quinoline...
A method for the hydrocyanation of alkenes and alkynes is based upon hydrozirconation followed by isonitrile insertion (Scheme 13); overall yields range from 45–90%.56 Certain examples do not exhibit the clean regiochemistry represented here, and these were discussed in Section 3.9.3.3.2. The...
The long-chain alkynes found in Petrosia, Pellina, Haliclona and other genera often possess remarkable cytotoxic activity against tumor cells that is not easily explained by the simple functionality that adorns the structures of these molecules, nor dismissed by non-specific lipid aggregations under ...