The invention provides a process for making compounds according to Formula I:
where R
1
, R
1a
, R
2
, R
2a
, R
3
and R
3a
are defined as set forth in the specification. Formula I compounds are useful as chelants and stabilizers of cations in aqueous media and the invention therefore provides a method for using the compounds in the treatment of subterranean formations, such as in acidizing operations.
本发明提供了一种制备公式I化合物的方法:其中,R1、R1a、R2、R2a、R3和R3a的定义如规范中所述。公式I化合物在
水介质中作为
螯合剂和阳离子稳定剂具有实用价值,因此本发明提供了一种使用该化合物处理地下地层的方法,例如在酸化操作中的应用。