Overcrowded ethylenes composed of 10-methyleneanthrone and two bulky aromatic rings {contain|include} a twisted carbon-carbon double (C=C) bond {as well as|in addition to|along with|and also|together with|and} a folded anthrone unit. As such, {they are|they’re|they may be} {unique|distinctive|special|exclusive|exceptional|one of a kind} frustrated aromatic enes (FAEs). {Various|Numerous|Different|A variety of|Several|Many} colored crystals {of these|of those} FAEs, obtained {using|utilizing|making use of|employing|working with|applying} {different|various|distinct|diverse|unique|distinctive} solvents, correspond to {multiple|numerous|several|a number of|many|various} metastable conformations {of the|from the|in the|on the|with the|of your} FAEs with {various|numerous|different|a variety of|several|many} twist and fold angles {of the|from the|in the|on the|with the|of your} C=C bond, {as well as|in addition to|along with|and also|together with|and} {various|numerous|different|a variety of|several|many} dihedral angles of attached aryl units with respect {to the|towards the|for the} C=C bond. The relationships {between|in between|among|amongst|involving} {color|colour} and these parameters {associated with|related to|connected with|linked to} conformational {features|attributes|functions|characteristics|capabilities|options} {around|about} the C=C bond {were|had been|have been} elucidated {using|utilizing|making use of|employing|working with|applying} experimental and theoretical {studies|research}. Owing {to the|towards the|for the} {fact|reality|truth} {that they are|that they’re} separated by {small|little|tiny|modest|smaller|compact} {energy|power} barriers, the variously colored conformations {in the|within the|inside the} FAE crystal {change|alter|modify|adjust|transform} in response to {various|numerous|different|a variety of|several|many} external stimuli, {such as|like|including|for example|for instance|which include} mechanical grinding, hydrostatic {pressure|stress} and thermal heating. tert-Butyl pent-4-ynoate Data Sheet 1260664-44-5 Chemical name PMID:23800738
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