Abstract
Heating of squaric acid (1) with the 1-aryl-3-methyl-5-oxo-2,5-dihydro-1H-pyrazoles 3a - j and the 1,3-disubstituted pyrazolinones 7a - d in the molar ratio of 1:2 in a mixture of n-BuOH/toluene afforded the bis(pyrazolyl)-squaraines 4a - j and 8a - d, respectively. Reaction of an excess of 1 with the pyrazolinone 3j yielded 4j and the 3-hydroxy-4-pyrazolyl-cyclobutene-1,2-dione 6 as a byproduct. In contrast to disubstituted pyrazolinones, the trisubstituted pyrazolinones 9a - e reacted with squaric acid (1) to give the hydroxy-oxopyrazolyl-cyclobutenediones 10a - e.
将squaric酸(1)与1-芳基-3-甲基-5-氧代-2,5-二氢-1H-
吡唑烯3a-j和1,3-二取代
吡唑烯酮7a-d在1:2的摩尔比下在n-
丁醇/
甲苯混合物中加热,分别得到双(
吡唑基)-squaraines 4a-j和8a-d。过量的1与
吡唑烯酮3j反应得到4j和3-羟基-4-
吡唑基-
环丁烯-1,2-二酮6作为副产物。与二取代
吡唑烯酮不同,三取代
吡唑烯酮9a-e与squaric酸(1)反应生成羟基-氧代
吡唑基-环
丁二酮10a-e。