The catalytic hydrogenation of alpha , beta -unsaturated ketones of the formula R1-CH=CH-CO-R2, in which R1 and R2 independently of one another represent straight-chain or branched alkyl, hydroxy-alkyl, alkenyl, cycloalkyl, cycloalkenyl, aralkyl or aryl, where at least one of the radicals ...
Rand Rare hydrogen or C-Calkyl, or Rand Rtogether are O, C-Calkylene or CH═CH; Ris C-Calkyl; R, R, R, R, Rand Rare for example hydrogen or C-Calkyl; and X is a x-valent cationic counter ion; are in particular suitable as photoinitiators for the curing with UV-A light (32...
Alpha Hydrogen - reactions and uses. Aldol condensation & Cross Aldol Condensation Reaction by aldehydes and ketones. To know more, visit BYJU'S.
This is on account of the reason that the remaining carbonions left after the abstraction of alpha-hydrogen atom by the base are resonance stabilised. For more details. consult section 8 (adol Condensation).
The invention relates to novel ketones of formulae I and II wherein R 1 , R 2 , R 3 , and R 4 , are, for example, C 1 , -C 8 , alkyl, R 5 ,is, for example,hydrogen,A is C 1 , , Br, -O-Ry, -NR8R9 or -S-R 16 , A 1 , is -O-, -NH- o NR8-,X and ...
The hydrogen transfer mechanism of cofactor reduction and recycling processes in the yeast reduction of α,β-unsaturated ketone was studied by using quantitative isotope tracing close to natural abundance measured by 2H NMR. In the reaction, the active cofactor is NADPH. The cofactor-transferred hydr...
Highly facile biomimetic regioselective ring opening of epoxides to halohydrins in the presence of β-cyclodextrin Highly regioselective ring opening of epoxides to halohydrins has been carried out in impressive yields with hydrogen and lithium halides in presence of β... M.Arjun Reddy and K Surend...
HYDROGEN-ION CONCENTRATIONKINETICSPhenylmethanesulfonyl fluoride reacts stoichiometrically with 伪-chymotrypsin, producing an inactive monosulfonyl enzyme and one ... AM Gold,D Fahrney - 《Biochemistry》 被引量: 885发表: 1964年 Effect of polyols on alpha-chymotrypsin thermostability: a mechanistic analysis...
关键词: Asymmetric catalysis Michael addition Hydrogen-bonding 年份: 2007 收藏 引用 批量引用 报错 分享 全部来源 求助全文 掌桥科研 相似文献Asymmetric Michael addition of α-nitro-ketones using catalytic peptides Peptide-based catalysts have been developed that promote the asymmetric Michael addition of...
High efficient epoxidation of alpha, beta-unsaturated ketones by hydrogen peroxide with a base hydrotalcite catalyst prepared from metal oxides The base hydrotalcite, prepared from MgO and Al_2O_3, acted as a highly efficient catalyst for the epoxidation of alpha, beta-unsaturated ketones using aqu...