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annulation (derived from annular, occasionally annelation) in organic chemistry is a chemical reaction in which a new ring is constructed on another molecule (often another ring).
im unterschied dazu enthalten spiroverbindungen ebenfalls mindestens zwei ringe bei denen jedoch nur ein ringglied (meist ein kohlenstoffatom) gleichzeitig bestandteil zweier ringe ist.
Last Update: 2016-03-03
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