醇盐或称烷氧基化合物，是醇中的羟基氢被金属取代后形成的一类化合物，形式上含有醇盐（烷氧基）负离子RO，其中R为有机取代基。醇盐具有很强的碱性，取代基R的体积不大时，还是很好的亲核试剂和配体。一般在质子溶剂（如水）中不稳定，是很多有机反应（如威廉姆逊合成法）的中间体结构，并且过渡金属的醇盐是常用的催化剂。

酚的酸性更强，生成的负离子盐称为酚盐，一般比醇盐要稳定，更易结晶和储存，但不如醇盐的亲核性强。

烯醇盐是由烯醇中的氢被取代而衍生出的一类化合物，一般可由酮或醛脱去α-氢质子得到。烯醇盐为两位反应阴离子，氧端和碳端都有亲核性，不同条件下两种反应产物的比例不同。

An alkoxide is the conjugate base of an alcohol and therefore consists of an organic group bonded to a negatively charged oxygen atom. They can be written as RO, where R is the organic substituent. Alkoxides are strong bases and, when R is not bulky, good nucleophiles and good ligands. Alkoxides, although generally not stable in protic solvents such as water, occur widely as intermediates in various reactions, including the Williamson ether synthesis. Transition metal alkoxides are widely used for coatings and as catalysts.