An antibody-drug conjugate having a cyclic benzylidene acetal linker represented by formula (1) or formula (2), wherein Y is an antibody; D is a drug; R.sup.1 and R.sup.6 are each independently a hydrogen atom or a hydrocarbon group; R.sup.2, R.sup.3, R.sup.4 and R.sup.5 are each independently an electron-withdrawing or electron-donating substituent or a hydrogen atom; s is 1 or 2, t is 0 or 1, and s+t is 1 or 2; w is an integer of 1 to 20; and Z.sup.1 and Z.sup.2 are each independently a selected divalent spacer: ##STR00001##

A compound is provided of Formula (I) ##STR00001##
wherein R.sup.1 represents a C.sub.3 to C.sub.20 hydrocarbon group derived from an alcohol of formula R.sup.1OH, from a formate of formula R.sup.1OCHO, or a cinnamyl aldehyde of Formula (II) ##STR00002##
wherein a compound of Formula I is capable of releasing a compound, when oxidized, selected from the group consisting of a fragrant alcohol of formula R.sup.1OH, a fragrant formate ester of formula R.sup.1OCHO and aryl aldehyde of Formula (III) ##STR00003##
wherein R.sup.2 is, independently, hydrogen atom, hydroxyl group, optionally substituted C.sub.1-C.sub.6 alkyl group, C.sub.1-C.sub.6 alkoxy group, or O(CO)CH(CH3).sub.2 wherein any two of R.sup.2 may form an optionally substituted 5 or 6 membered ring. The compounds are useful for example as a precursor for the prolonged delivery or release of fragrant compounds such as fragrant alcohols, fragrant aldehydes or fragrant formates.

A compound is provided of Formula (I) ##STR00001##
wherein R.sup.1 represents a C.sub.3 to C.sub.20 hydrocarbon group derived from an alcohol of formula R.sup.1OH, from a formate of formula R.sup.1OCHO, or a cinnamyl aldehyde of Formula (II) ##STR00002##
wherein a compound of Formula I is capable of releasing a compound, when oxidized, selected from the group consisting of a fragrant alcohol of formula R.sup.1OH, a fragrant formate ester of formula R.sup.1OCHO and aryl aldehyde of Formula (III) ##STR00003##
wherein R.sup.2 is, independently, hydrogen atom, hydroxyl group, optionally substituted C.sub.1-C.sub.6 alkyl group, C.sub.1-C.sub.6 alkoxy group, or O(CO)CH(CH3).sub.2 wherein any two of R.sup.2 may form an optionally substituted 5 or 6 membered ring. The compounds are useful for example as a precursor for the prolonged delivery or release of fragrant compounds such as fragrant alcohols, fragrant aldehydes or fragrant formates.

A compound is provided of Formula (I) ##STR00001##
wherein R.sup.1 represents a C.sub.3 to C.sub.20 hydrocarbon group derived from an alcohol of formula R.sup.1OH, from a formate of formula R.sup.1OCHO, or a cinnamyl aldehyde of Formula (II) ##STR00002##
wherein a compound of Formula I is capable of releasing a compound, when oxidized, selected from the group consisting of a fragrant alcohol of formula R.sup.1OH, a fragrant formate ester of formula R.sup.1OCHO and aryl aldehyde of Formula (III) ##STR00003##
wherein R.sup.2 is, independently, hydrogen atom, hydroxyl group, optionally substituted C.sub.1-C.sub.6 alkyl group, C.sub.1-C.sub.6 alkoxy group, or O(CO)CH(CH3).sub.2 wherein any two of R.sup.2 may form an optionally substituted 5 or 6 membered ring. The compounds are useful for example as a precursor for the prolonged delivery or release of fragrant compounds such as fragrant alcohols, fragrant aldehydes or fragrant formates.

An antibody-drug conjugate having a cyclic benzylidene acetal linker represented by formula (1) or formula (2), wherein Y is an antibody; D is a drug; R.sup.1 and R.sup.6 are each independently a hydrogen atom or a hydrocarbon group; R.sup.2, R.sup.3, R.sup.4 and R.sup.5 are each independently an electron-withdrawing or electron-donating substituent or a hydrogen atom; s is 1 or 2, t is 0 or 1, and s+t is 1 or 2; w is an integer of 1 to 20; and Z.sup.1 and Z.sup.2 are each independently a selected divalent spacer:

##STR00001##

An antibody-drug conjugate having a cyclic benzylidene acetal linker represented by formula (1) or formula (2), wherein Y is an antibody; D is a drug; R.sup.1 and R.sup.6 are each independently a hydrogen atom or a hydrocarbon group; R.sup.2, R.sup.3, R.sup.4 and R.sup.5 are each independently an electron-withdrawing or electron-donating substituent or a hydrogen atom; s is 1 or 2, t is 0 or 1, and s+t is 1 or 2; w is an integer of 1 to 20; and Z.sup.1 and Z.sup.2 are each independently a selected divalent spacer:

##STR00001##

Disclosed herein are reaction compositions comprising an oxidation catalyst, a solvent, and a substrate that is dissolved in the solvent. The oxidation catalyst comprises a metal ion complexed with an -keto acid and a tridentate N,N,O-ligand. Also disclosed herein are methods for oxidizing a CH bond of a molecule, the methods comprising contacting the molecule with a metal complex comprising a metal ion complexed with a tridentate N,N,O-ligand in the presence of an -keto acid and a solvent. In some embodiments, the oxidation catalyst or metal complex is linked to a solid support.

Disclosed herein are reaction compositions comprising an oxidation catalyst, a solvent, and a substrate that is dissolved in the solvent. The oxidation catalyst comprises a metal ion complexed with an -keto acid and a tridentate N,N,O-ligand. Also disclosed herein are methods for oxidizing a CH bond of a molecule, the methods comprising contacting the molecule with a metal complex comprising a metal ion complexed with a tridentate N,N,O-ligand in the presence of an -keto acid and a solvent. In some embodiments, the oxidation catalyst or metal complex is linked to a solid support.

Disclosed herein are reaction compositions comprising an oxidation catalyst, a solvent, and a substrate that is dissolved in the solvent. The oxidation catalyst comprises a metal ion complexed with an -keto acid and a tridentate N,N,O-ligand. Also disclosed herein are methods for oxidizing a CH bond of a molecule, the methods comprising contacting the molecule with a metal complex comprising a metal ion complexed with a tridentate N,N,O-ligand in the presence of an -keto acid and a solvent. In some embodiments, the oxidation catalyst or metal complex is linked to a solid support.

Shell-and-tube devices typically require regular maintenance. Described herein is an automated method for tracking the status of individual tubes during maintenance activities and recording status data for review and analysis. Status data may optionally be reported in real-time summary format and/or used to predict time-to-completion. The method helps to reduce the expense of performing maintenance activities in shell-and-tube devices, including shell-and-tube reactors and heat exchangers.