Processes for producing dialdehyde monoacetals
First Claim
1. A method of producing a dialdehyde monoacetal (III) from a dialdehyde (I) and a diol (II) characterised in that it comprises:
- a first step where said dialdehyde (I) and said diol(II) are reacted to obtain a dialdehyde bisacetal (IV), the mole amount of said diol(s) (II) being at least twice amount of said dialdehyde (I); and
a second step where said dialdehyde bisacetal (IV) is reacted with said dialdehyde (I);
said dialdehyde (I), diol (II), dialdehyde monoacetal (III) and dialdehyde bisacetal (IV) being shown in the following Formulae (I) to (III) ##STR10## wherein R1 is a hydrocarbon group
space="preserve" listing-type="equation">HO--R.sup.2 --OH (II)wherein R2 is a hydrocarbon group ##STR11## (wherein R1 and R2 are the same as in Formulae (I) and (II) respectively ##STR12## wherein R1 and R2 are the same as in Formulae (I) and (II) respectively.
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Abstract
In a method of producing a dialdehyde monoacetal(s) (III) from dialdehyde(s) (I) and diol(s) (II), the present invention provides a method comprising a first step wherein said dialdehyde(s) (I) and said diol(s) (II) are reacted to produce dialdehyde bisacetal(s) (IV), the amount by mole of said diol(s) (II) being at least twice the amount by mole of said dialdehyde (I) and a second step wherein said dialdehyde bisacetal(s) (IV) is reacted with said dialdehyde (I). The present invention also provides a method of producing a glutaraldehyde monoacetal via reacting 2-Y-3, 4-dihydro-2H-pyran or a ring-substituted derivative thereof with diol. This method comprises a second step reaction wherein glutaraldehyde (iv) which is one of the by-products of the first step reaction is reacted with glutaraldehyde bisacetal (v) which is another by-product of said first reaction. According to the present invention, in the above-mentioned method of producing a glutaraldehyde monoacetal (iii), after the end of the first step reaction, the crude reaction solution is heated at a temperature of from 100° C. to 200° C. to produce the glutaraldehyde monoacetal (iii) from the by-products, low boiling-point components produced from the substituant group Y being removed via distillation.
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10 Claims
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1. A method of producing a dialdehyde monoacetal (III) from a dialdehyde (I) and a diol (II) characterised in that it comprises:
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a first step where said dialdehyde (I) and said diol(II) are reacted to obtain a dialdehyde bisacetal (IV), the mole amount of said diol(s) (II) being at least twice amount of said dialdehyde (I); and a second step where said dialdehyde bisacetal (IV) is reacted with said dialdehyde (I);
said dialdehyde (I), diol (II), dialdehyde monoacetal (III) and dialdehyde bisacetal (IV) being shown in the following Formulae (I) to (III) ##STR10## wherein R1 is a hydrocarbon group
space="preserve" listing-type="equation">HO--R.sup.2 --OH (II)wherein R2 is a hydrocarbon group ##STR11## (wherein R1 and R2 are the same as in Formulae (I) and (II) respectively ##STR12## wherein R1 and R2 are the same as in Formulae (I) and (II) respectively. - View Dependent Claims (2, 3)
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4. A method for producing a glutaraldehyde monoacetal via reacting a 2-Y-3, 4-dihydro-2H-pyran or a ring-substituted derivative thereof as shown in General Formula (i) with a diol as shown in General Formula (ii) to obtain glutaraldehyde monoacetal as shown in General Formula (iii), characterised in that said glutaraldehyde monoacetal (iii) is produced in a second step reaction wherein said glutaraldehyde (iv) which is a by-product of the first step reaction is reacted with glutaraldehyde bisacetal (v) which is another by-product of the same reaction;
- 2-Y-3, 4-dihydro-2H-pyran, diol (ii), glutaraldehyde monoacetal (iii), glutaraldehyde (iv) and glutaraldehyde bisacetal (v) being as shown in the following General Formulae;
##STR13## wherein Y is a hydroxy group, an alkoxy group, an aryloxy group or an aralkyloxy group
space="preserve" listing-type="equation">HO--R--OH (ii)wherein R is a divalent saturated or unsaturated hydrocarbon group having from 1 to 10 carbon atoms ##STR14## wherein R is as defined in General Formula (ii) ##STR15## wherein R is as defined in General Formula (ii). - View Dependent Claims (5, 6, 7, 8, 9, 10)
- 2-Y-3, 4-dihydro-2H-pyran, diol (ii), glutaraldehyde monoacetal (iii), glutaraldehyde (iv) and glutaraldehyde bisacetal (v) being as shown in the following General Formulae;
Specification