N-Substituted Cyclic Alkylene Urea Synthesis via Basic Catalyst
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Solution Overview
Problem
Existing methods for synthesizing N-substituted cyclic alkylene ureas often require high temperatures and involve complex reaction conditions, limiting efficiency and yield.
Innovation Solution
A process involving the reaction of multifunctional aliphatic amines with at least two amino groups and aliphatic organic carbonates in the presence of a basic catalyst, optimizing the stoichiometry to facilitate the formation of N-substituted cyclic alkylene ureas with good yield and control over functional groups.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If high temperature heating is used to synthesize cyclic alkylene ureas (as in Fischer and Koch method), then the reaction can proceed, but the energy consumption increases and the reaction conditions become complex
Solution Approach 1:
The invention changes the reaction parameters by introducing a basic catalyst system (alkali metal hydroxide or alkoxide) that enables the reaction to proceed at lower temperatures (60-150°C) compared to conventional high-temperature methods. The catalyst modifies the reaction pathway, allowing cyclic alkylene urea formation under milder thermal conditions while maintaining good yields.
Solution Approach 2:
The invention uses an intermediary substance (basic catalyst such as NaOH, KOH, or alkoxides) to mediate the reaction between the amine and carbonate. This intermediary facilitates the reaction by providing a different mechanism that avoids the need for high temperature direct heating, thereby reducing energy consumption while enabling the cyclization reaction to proceed efficiently.
2Productivity
If conventional methods are used to synthesize N-substituted cyclic alkylene ureas, then the process is established, but the yield and efficiency are limited
Solution Approach 1:
The invention optimizes reaction parameters including temperature range (60-150°C), catalyst selection (alkali metal hydroxide or alkoxide), and stoichiometry to achieve improved yields and efficiency. By adjusting these parameters, the process achieves higher productivity while maintaining reliable and reproducible results compared to conventional methods.
Solution Approach 2:
The basic catalyst acts as an intermediary that enhances the reaction efficiency and yield by facilitating the nucleophilic attack and cyclization steps. The catalyst system provides a more efficient pathway with better atom economy and reduced side reactions, leading to improved overall productivity and reliability of the synthesis process.
3Adaptability or versatility
If multifunctional amines with multiple amino groups are used, then diverse N-substituted cyclic alkylene ureas can be formed, but the stoichiometry control becomes complex
Solution Approach 1:
The invention manages the complexity of stoichiometry control by optimizing the molar ratios of reactants and catalysts. By establishing specific parameter ranges for amine:carbonate:catalyst ratios, the process achieves good control over the reaction outcome even with multifunctional amines, enabling product diversity while maintaining manageable process complexity through defined stoichiometric relationships.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This process allows for the efficient synthesis of N-substituted cyclic alkylene ureas with hydroxyalkyl, aminoalkyl, or carbamoylalkyl substituents, offering a route to various cyclic urea products with high purity and minimal water content, and the ability to produce multicyclic structures.
Implementation Method 1
The reaction of a multifunctional aliphatic amine with a dialkyl carbonate or an alkylene carbonate, preferably in the presence of a basic catalyst, leads to formation of N-substituted cyclic alkylene ureas
Data Source
AI summary
The invention relates to a process for the synthesis of N-substituted cyclic alkylene ureas by reacting a multifunctional aliphatic amine A having at least two amino groups which may be primary or secondary, at least one of which is a primary amino group, -NH2, and at least one of which is a secondary amino group, >NH, the other hydrogen group whereof having been substituted by a hydrocarbyl group which in turn may be substituted by a hydroxyl group, or an amino group, or a carboxyl group, or a ketone carbonyl group, or a hydrazide or hydrazone group, or a mercaptan group, and at least one further functional group selected from the group consisting of primary or secondary amino groups and hydroxyl groups, and an aliphatic organic carbonate component C selected from the group consisting of dialkyl carbonates CD and of alkylene carbonates CA.