A divalent chemical group containing arsenic, capable of bonding to two other atoms or groups in organic compounds.
From arsenic plus -ylene suffix, indicating a divalent linking group. Follows the pattern of ethylene, phenylene, and other bridging chemical groups.
The difference between -yl (monovalent), -ylene (divalent), and -ylidene (divalent but different) shows how chemists encode bonding patterns in their spelling—a molecular grammar system that lets them describe structure in syllables.
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