Chelating Picolinaldehyde Hydrazone Amides as Protecting ...

2021年3月5日 — Protection of carboxylic acids: Methyl esters – Removed by acid or base. Benzyl esters – Removed by hydrogenolysis. tert-Butyl esters – Removed ...

由 Z Fang 著作 · 2019 · 被引用 3 次 — Benzyl is one of the most common protective groups for carboxylic acids and the removal of benzyl to regenerate carboxylic acids usually ...

Protecting group is moderately stable / might react. Protecting group is labile. Carboxyl Protecting Groups Stability. Methyl ester. H2O: pH < 1, 100°C, pH = 1 ...

(i) Direct preparation from a carboxylic acid and an alcohol. Since the alcohol is used in large excess, it must be cheap and volatile. Hence the method is good.

由 Y Nishikawa 著作 · 2022 · 被引用 1 次 — Esters are the most widely used protecting groups for carboxylic acids. (1) However, most esters are problematic in multistep reactions because ...

由 S Shahsavari 著作 · 2018 · 被引用 7 次 — In multistep organic synthesis, the carboxylic acid function is usually protected in the forms of primary, secondary and tertiary alkyl, trityl, ...

1999年4月9日 — Carboxylic acids are protected for a number of reasons: (1) to mask the acidic proton so that it does not interfere with base-catalyzed ...

Protecting an amine as a carbamate therefore enables other functional groups to undergo selective reactions with electrophiles whereby the carbamate (protected ...

由 J Tan 著作 · 2013 · 被引用 22 次 — Historically, silyl groups have rarely been utilized as a protecting group for carboxylic acids in organic synthesis, as the Si-O bonds are too ...