hydrazone वाक्य
उदाहरण वाक्य
मोबाइल
- The hydrazone is then deprotonated on the ?-carbon position by a strong base, such as lithium diisopropylamide ( LDA ), leading to the formation of a resonance stabilized anion-an azaenolate.
- The development and modification of Enders'hydrazone alkylation reaction mainly focus on the addition of more steric hindrance on the pyrrolidine rings of both SAMP and RAMP, while preserving the methoxy group for lithium chelation.
- A Shapiro reaction of the vinyllithium compound derived from hydrazone "'4.1 "'with aldehyde "'4.2 "'makes the first connection that will become the B ring.
- Several reversible reactions have been proposed and / or applied in protein-directed DCC . These included boronate ester formation, diselenides-disulfides exchange, disulphide formation, hemithiolacetal formation, hydrazone formation, imine formation and thiol-enone exchange.
- The ?, ?-unsaturated hydrazone is brominated by DDH in allylic position at the sulfonamide nitrogen, which constitutes the capto-dative stabilized radical position, and the bromide ion becomes the leaving group in the following nucleophilic attack of an alcoholate ion.
- The first step is the formation of acetone imine, Me 2 C = NH; this is then oxidized by hydrogen peroxide through a complex mechanism to give 3, 3-dimethyloxaziridine, which reacts with a further molecule of ammonia to produce acetone hydrazone.
- When the hydrazone "'1 "'in " scheme 5 " is reacted with iodine and triethylamine in toluene, the expected reaction product is not the di-iodide "'10 "'through path B in a free radical mechanism.
- "' Methasterone "'( nickname "'Superdrol "'), also known as "'methyldrostanolone "', is an designer steroid . Mebolazine is formed by hydrazone formation between 2 equivalents of methasterone with 1 equivalent of hydrazine.
- Recent developments that exploit proximal functional groups have enabled hydrazone condensations to operate at 20 M " 1 s " 1 at neutral pH while oxime condensations have been discovered which proceed at 500-10000 M " 1 s " 1 at neutral pH without added catalysts.
- "' Testosterone enanthate benziloylhydrazone "', also known as "'testosterone 17?-enanthate 3-benzilic acid hydrazone "', is a injected anabolic-androgenic steroid and an androgen ester specifically, the C17? enanthate ester and C3 benzilic acid hydrazone of testosterone which was never marketed.
- "' Testosterone enanthate benziloylhydrazone "', also known as "'testosterone 17?-enanthate 3-benzilic acid hydrazone "', is a injected anabolic-androgenic steroid and an androgen ester specifically, the C17? enanthate ester and C3 benzilic acid hydrazone of testosterone which was never marketed.
- Uncoupling proteins play a role in normal physiology, as in cold exposure or hibernation, because the energy is used to generate heat ( see thermogenesis ) instead of producing ATP . However, other substances, such as 2, 4-dinitrophenol and carbonyl cyanide m-chlorophenyl hydrazone, also serve the same uncoupling function, and are considered poisonous.
- The first step is the deprotonation of the hydrazone of diazo compounds using CsF . At this point, the conjugate base could either decompose to give the diazo compound and undergo a [ 3 + 2 ] dipolar cycloaddition with the aryne to give the product, or a [ 3 + 2 ] annulation with aryne which would also give the final product.
- The preparation of L-( " R " )-coniine by the reduction of ?-coniceine ( L-propenylpiperidine ) by L�ffler and Friedrich incorrectly, that pelletierine was the aldehyde ( ?-2-piperidyl-propaldehyde ) corresponding to coniine, and yielded " rac-" coniine when its hydrazone was heated with sodium ethoxide in ethanol at 156 170 �C . According to these authors, D-( " S " )-coniine is rendered almost optically inactive when heated with barium hydroxide and alcohol at 180 230 �C . Leithe has shown by observation of the optical rotation of ( + )-pipecolic acid ( piperidine-2-carboxylic acid ) and some of its derivatives under varying conditions, that it must belong to the D-series of amino acids.
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