The present invention describes chemicals that have certain properties which cause them to be free or substantially free from endocrine disruptive activity. As a result, the chemicals are useful in producing plastic materials that may be used in products which are exposed to individuals in which endocrine disruptive activity is particularly disadvantageous, such as baby bottles, baby toys, food containers, medical containers, animal cages and medical products. The chemicals may also be useful as additives which are used in food products that are ingested by individuals in which endocrine disruptive activity is particularly disadvantageous, such as newborns or the physically infirm.