2016年12月29日 · It is the monovalent group -OH which contains hydrogen and oxygen. The suffix -yl indicates it's a radical just like carbonyl. Hydroxy or hydroxy group: A hydroxy or hydroxy group is the entity with the formula $\ce{-OH}$. It contains oxygen bonded to hydrogen. Hydroxy is also prefix which means containing hydroxyl group.

2016年3月21日 · Typically, there is enough water in typical samples (or the solvents themselves!) to ensure that the hydroxyl proton is rapidly exchanging and this effectively decouples the spin from its neighbors. If you're in a position to make a sample yourself - get a stable organic solid with a hydroxyl that you can dry in a drying oven (or lyopholize it ...

2015年2月26日 · Isn't the lone pair on the methoxy group oxygen more available for participating in resonance into the ring than the lone pair on hydroxyl oxygen due to the +I effect of the methyl group? Or is it because of the steric hindrance of the methoxy group that will favour lesser substitution at the ortho- position of the benzene ring?

2020年8月21日 · OP's statement of "In all oxidation reactions of glucose, it seems that the aldehyde group alone gets oxidised and none of the hydroxyl groups" is not entirely true. For example, the step by oxidative cleavage with periodic acid ( $\ce{HIO4}$ ) has been successfully applied in the constitutional analysis of sugars.

2022年5月26日 · I am looking for a way of converting a hydroxyl group into a carboxyl group in an aqueous environment for eventual coupling to an amine. There seem to be plenty of ways of achieving this in various solvent e.g. using succinic anhydride (see below scheme for mPEG)

2019年5月19日 · Hydroxyl follows that rule. Finally -- electrophilic substitution in a naphthalene system is kinetically favored next to the other ring. See here for example. We have one position that's on the same ring as hydroxyl, ortho or para to that hydroxyl group, and next to the other ring. That is the position shown in the book.

2017年10月4日 · On the other hand, deprotonation of the hydroxyl group will not lead to any resonance stabilization, such that the hydroxyl group will be much less acidic than the carboxyl groups. In fact, the $\mathrm{p}K_\mathrm{a}$ of alcohols is usually in the range 16-20, which means that the alcoholic hydrogen will not deprotonate in water.

2013年6月21日 · I suspect they were talking about hydroxyl groups in molecules, in which case Eric's answer (though rather short) is correct thermodynamically, and kinetically it probably has to do with silicon's larger size which would stabilize a five-coordinated transition state where the hydroxyl group attacks the silicon atom in a silane directly. $\endgroup$

2015年1月2日 · An epoxy group reacts with ONE amine-hydrogen, i.e. one hydrogen attached directly to a Nitrogen atom (hence also amine-hydrogen equivalent weight). Note that every time that an epoxy group is opened; one Hydroxyl group …

2018年3月31日 · Conversion of Hydroxyl group to free amine in polyethylene glycol: This is a case of converting a primary alcohol to a primary amine $$\ce{R-CH2OH -> -> -> R-CH2NH2}$$ To my understanding, converting hydroxyl group to imidazole carbamate as an active intermediate is not the way to do this.