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sigmatron
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The answer SIGMATRON has 1 possible clue(s) in existing crosswords.
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The word SIGMATRON is VALID in some board games. Check SIGMATRON in word games in Scrabble, Words With Friends, see scores, anagrams etc.
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Definitions of sigmatron in various dictionaries:
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Possible Crossword Clues |
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X-ray machine is something heaved mostly by nurse |
Last Seen in these Crosswords & Puzzles |
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Mar 1 2013 The Times - Cryptic |
Sigmatron might refer to |
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A sigmatropic reaction in organic chemistry is a pericyclic reaction wherein the net result is one σ-bond is changed to another σ-bond in an uncatalyzed intramolecular process. The name sigmatropic is the result of a compounding of the long-established sigma designation from single carbon–carbon bonds and the Greek word tropos, meaning turn. In this type of rearrangement reaction, a substituent moves from one part of a π-bonded system to another part in an intramolecular reaction with simultaneous rearrangement of the π system. True sigmatropic reactions are usually uncatalyzed, although Lewis acid catalysis is possible. Sigmatropic reactions often have transition-metal catalysts that form intermediates in analogous reactions. The most well-known of the sigmatropic rearrangements are the [3,3] Cope rearrangement, Claisen rearrangement, Carroll rearrangement and the Fischer indole synthesis. |