Heterocycles Group

These substances were identified for action under the Chemicals Management Plan (CMP). This screening assessment focuses on 4 of 7 substances referred to collectively as the Heterocycles Group.

Information sheet

Summary of publications
Substance group CAS RN Common name DSL name Draft screening assessment Proposed conclusion on section 64 criteria Follow-up activities
Heterocycles Group 96-45-7 Ethelyene thiourea (ETU) 2-imidazolidinethione HTML Does not meet Under consideration
100-97-0 Methenamine 1,3,5,7-tetraazatricyclo[3.3.1.13,7]decane None planned at this time
110-91-8 Morpholine Tetrahydro-1,4-oxazine
4174-09-8 N/A 3H-pyrazol-3-one, 2,4-dihydro-4-[(5-hydroxy-3-methyl-1-phenyl-1H-pyrazol-4-yl)methylene]-5-methyl-2-phenyl- Under consideration

 

Timelines
Date Activity
November 2018 Anticipated publication of the final screening assessment.
November 11, 2017 Publication and start of 60-day public comment period on the draft screening assessment (including follow-up activities for ETU and CAS RN 4174-09-8).  The related notice was published in the Canada Gazette, Part I: Vol. 151, No. 45.

Background

Three other substances (CAS RNs132-65-0, 28984-69-2, and 68909-18-2) were identified as being a part of the Heterocycles Group at the outset of the third phase of the CMP.  These substances were subsequently determined to be of low concern to both human health and the environment, through other approaches. Conclusions for these 3 substances are provided in the Screening Assessment for Substances Identified as Being of Low Concern based on the Ecological Risk Classification of Organic Substances and the Threshold of Toxicological Concern (TTC)-based Approach for Certain Substances.

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