2018年4月27日 · If there are two active methylenes, the condensation can occur on each side of the carbonyl group. For example, benzaldehyde with acetone gives dibenzalacetone. By analogy, I predict that the reaction of 4-methylbenzaldehyde with cyclohexanone will form (2E,6E)-4-methyl-2,6-bis (4-methylbenzylidene)cyclohexanone.

2015年12月27日 · If there are two active methylenes, the condensation can occur on each side of the carbonyl group. For example, benzaldehyde reacts with acetone to give dibenzalacetone. By analogy, I predict that 4-methylbenzaldehyde will react with acetone to form (E,E)-bis (4-methylbenzylidene)acetone. The major product should be the more stable E,E isomer.

2015年12月26日 · If there are two active methylenes, the condensation can occur on each side of the carbonyl group. For example, benzaldehyde with acetone gives dibenzalacetone. By analogy, I predict that 4-methylbenzaldehyde with cyclopentanone will form (2E,5E)-2,5-bis (4-methylbenzylidene)cyclopentanone.

2018年5月3日 · The product is (1Z,4Z)"-1,4-bis (4-ethoxyphenyl)penta-1,4-dien-3-one". > It looks like you are doing a crossed aldol condensation. The aldehyde has no acidic α-hydrogen. However, the hydrogen atoms of both methyl groups in acetone are acidic. The general equation for the reaction is "ArCH (=O)"+ "CH"_3"C (=O)CH"_3 + " (O=)CHAr" → "ArCH=CHC …

2015年9月17日 · "Symmetry" is key to the process. Any groups (of hydrogen, carbon etc.) that can be interchanged by a proper axis of rotation or a fast moving process are said to be "equivalent" ("isochronous") in the NMR spectrum, and should give rise to the same chemical shift. How does this help? Well, you've got to look at the representation of your molecule …

IUPAC nomeclature is an international way of naming organic compounds in which each organic structure is uniquely named. Through the IUPAC names, bonded molecules and structural components of the compound are clear.