The Reaction of Hydrazine with α‐Cyanocinnamate Esters: A Caveat
作者:Paul J. Erdman、Jimmy L. Gosse、Jamey A. Jacobson、David E. Lewis
DOI:10.1081/scc-120028648
日期:2004.12.31
Abstract α‐Cyanocinnamate esters react with hydrazine to give initial products of conjugate addition that then undergo a fragmentation to give the azine of the carbonyl precursor to the starting ester, rather than intramolecular aminolysis to give the pyrazolidinone.
The present invention relates to methods for dyeing keratinous fibers, without significantly damaging the hair. According to the method of the present invention the fibers are treated in a dry state by contacting said fibers with at least one oxidoreductase and at least one dye precursor. In this way it is possible to dye, e.g. human hair, in a simple and efficient manner.
Indicating devices based on lateral diffusion of a mobile phase through a non-porous stationary phase
申请人:JP LABORATORIES, INC
公开号:US10451595B2
公开(公告)日:2019-10-22
This invention relates to indicating devices, such as time-temperature indicators based on lateral diffusion of a vapor of a solid and/or liquid mobile phase (e.g., a sublimeable dye or an activator) through a non-porous stationary phase, such as a thin layer of a polymeric material. The lateral diffusion of the mobile phase creates a noticeable boundary in the stationary phase whose movement depends upon processes, such as time and temperature.
There is provided a device (
10
) for monitoring sterilization of a material with steam comprising at least one layer (
20
), having incorporated therein an isomeric indicator (
22
), capable of undergoing at least one color change and optionally a controller (
23
) for said indicator capable of influencing the time and temperature required for said color change when contact with steam. Composed of polymeric binder (
21
).
Described is radiation sensitive imaging and dosimeter composition (
20
) containing a radiation sensitive material (
21
), e.g., a diacetylene (R—C═C—C═C—R′, where R and R′ are substituent groups) or a radiochromic dye, a polymeric binder (
22
) and optionally a solvent (
23
) and/or an activator (
24
). Radiation sensitive materials are incorporated into a moldable or castable material and are molded or casted into shaped-articles (
100
), such as coatings, films, fiber, plaques, rods and blocks. Upon exposure to high-energy radiations, radiation sentitive material develops color thereby producing a visible image. Because of the higher thickness, a significantly lower dose of radiation can be monitored and an image is produced in three dimensions. Materials, processes and usages for thick radiation sensitive devices are described. A thick block can be used for monitoring radiation dosages in the three dimensions.