Direct observation by 1 H NMR of 4,5-benzoxepin-2,3-oxide and its surprisingly rapid ring-opening rearrangement to 1 H -2-benzopyran-1-carboxaldehyde
作者:Dhananjaya Nauduri、Arthur Greenberg
DOI:10.1016/j.tetlet.2004.04.081
日期:2004.6
The first unambiguous observation of an oxepin-2,3-oxide is reported. Between 5 and 10 °C it rearranges rapidly to its isomer 1H-2-benzopyran-1-carboxaldehyde. In contrast, 2,3-oxides of monocyclic oxepins rearrange to stable, ring-opened dialdehydes or diketones.
据报道,oxepin-2,3-氧化物的第一个明确观察。在5至10°C之间,它迅速重排为异构体1 H -2-苯并吡喃-1-甲醛。相反,单环氧杂环丁烷的2,3-氧化物重新排列成稳定的,开环的二醛或二酮。
Radiationhardenable printing media, transfer pictures produced therewith, and method for producing ceramic decorations
申请人:Ragnetti Maurizio
公开号:US20060134554A1
公开(公告)日:2006-06-22
The invention relates to a radiation-curable printing medium based on a thermoplastic polymer and at least one radiation-curable monomeric compound. By means of a compound which comprises a heterocyclic ring, it is possible to achieve a favourable combination of properties comprising reactivity and flexibility of the decoration. Preferred monomeric compounds contain a 1,3-dioxolane or 1,3- or 1,4-dioxane ring, and an acrylic or methacrylic group is attached in the manner of an ester around a methylol group. The invention also provides transfers containing the printing medium and decorative preparations.