Unexpected rate enhancement in the intramolecular carboxylic acid-catalyzed cleavage ofo-carboxybenzohydroxamic acid

Khan, M. Niyaz

doi:10.1002/(sici)1099-1395(199803)11:3<216::aid-poc992>3.0.co;2-9

Cited by 10 publications

(1 citation statement)

References 21 publications

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“…Despite this fact, a huge amount of kinetic data on the effects of pure and mixed solvents on the reaction rates are available and they provide some very useful insights regarding the mechanistic aspects of these reactions. However, the kinetic data on the effects of mixed aqueous-organic solvents on the intramolecular assisted-reaction rates are relatively rare (Khan & Ariffin 2003;Sim et al 2004;Sim et al 2006;Khan 1993;Ariffin & Khan 2005;Khan 1998).…”

Section: Resultsmentioning

confidence: 99%

ASM Sci. J., Vol. 2, No. 1, 2008

Liki

2008

ASMScJ

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The ASM Sc. J. has come of age. With a total of nearly 300 pages of text in three issues, it is now in the second year ofpublication. In this fi rst issue of the second volume, there is again evidence of a multi-disciplinary blend of articles/topics onmedicine, expert systems for diagnosis of breast diseases, ultra-wideband signals, chemical reaction analysis, applicationof nanotechnology, nanoporous materials, growth and production of biosurfactants, carbon nanotubes, goat spermmorphology, speech recognition algorithms, alkaline hydrolysis of N-(2’-hydroxyphenyl)phthalimide, and mathematics(fractional integral operator)—all contained in a concise manner, contributed by 30 scientists in collaborative R&Dwork.The varied and increasing role of computers, computer-based systems, expert and knowledge-based systems, simulationand mathematical modelling in industry, science and medicine is also evident in various articles in this issue.The next issue (ASM Sc. J., vol. 2, no. 2) will contain 10 articles on photonics—this being a feature in this Journal, asmentioned in the Editorial of the maiden issue, where periodically there will be a concentration of articles on particularthematic subject areas.In attracting and ensuring the publication of a wide variety of articles on scientific topics, the Academy of Science Malaysiacontinues to fulfil its objective of promoting and harnessing science, technology and innovation for the progress ofhumanity at large. Research opens up wide horizons and new data crowds upon us swiftly. Sharing this knowledge is notonly desirable but also vital for knowledge is international and indivisible. The Academy of Science Malaysia continues,therefore, to stress on the importance of publishing research findings.

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Section: Resultsmentioning

confidence: 99%

ASM Sci. J., Vol. 2, No. 1, 2008

Liki

2008

ASMScJ

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Effects of CH3OH-H2O and CH3OH solvents on rate of reaction of phthalimide with piperidine

Khan

2000

Int J Chem Kinet

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Effects of mixed aqueous‐organic solvents on the rate of intramolecular carboxylic group‐catalyzed cleavage of N‐(4′‐methoxyphenyl)phthalamic acid

Leng

Ariffin

Khan

2004

Int J of Chemical Kinetics

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Kinetic study on the cleavage of N-(4 -methoxyphenyl)phthalamic acid (NMPPAH) in mixed H 2 O-CH 3 CN and H 2 O-1,4-dioxan solvents containing 0.05 M HCl reveals the formation of phthalic anhydride (PAn)/phthalic acid (PA) as the sole or major product. Pseudo first-order rate constants (k 1 ) for the conversion of NMPPAH to PAn decrease nonlinearly from 60.4 × 10 −5 to 2.64 × 10 −5 s −1 with the increase in the contents of 1,4-dioxan from 10 to 80% v/v in mixed aqueous solvents. The rate of cleavage of NMPPAH in mixed H 2 O-CH 3 CN solvents at ≥50% v/v CH 3 CN follows an irreversible consecutive reaction path:

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Unexpected rate enhancement in the intramolecular carboxylic acid-catalyzed cleavage ofo-carboxybenzohydroxamic acid

Cited by 10 publications

References 21 publications

ASM Sci. J., Vol. 2, No. 1, 2008

ASM Sci. J., Vol. 2, No. 1, 2008

Effects of CH3OH-H2O and CH3OH solvents on rate of reaction of phthalimide with piperidine

Effects of mixed aqueous‐organic solvents on the rate of intramolecular carboxylic group‐catalyzed cleavage of N‐(4′‐methoxyphenyl)phthalamic acid

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