N
N
S
N
O
N
11­
15­
01
MEMORANDUM
SUBJECT:
Tebuthiuron.
List
A
Reregistration
Case
0054.
PC
Code
105501.
Product
Chemistry
Chapter
for
the
Tolerance
Renewal
Eligibility
Decision
[TRED]
Document.
DP
Barcode
D277104.

FROM:
K.
Dockter,
Chemist
Reregistration
Branch
2
Health
Effects
Division
[7509C]

THRU:
Alan
Nielsen,
Branch
Senior
Scientist
Reregistration
Branch
2
Health
Effects
Division
[7509C]

TO:
Paula
Deschamp,
Risk
Assessor
Reregistration
Branch
2
Health
Effects
Division
[7509C]

Tebuthiuron
{N­[
5­(
1,1­
dimethylethyl)­
1,3,4­
thiadiazol­
2­
yl]­
N,
N'­
dimethylurea}
is
a
nonselective
herbicide.

Empirical
formula:
C9H16N4OS
Molecular
weight:
228.3
CAS
Registry
No.:
34014­
18­
1
PC
Code:
105501
Chemical
structure
by
J.
Punzi
A
search
of
REFS
conducted
10/
12/
01
identified
a
single
tebuthiuron
technical
[T]
registered
under
PC
Code
105501,
the
Dow
Agrosciences
LLCo
Spike*
Technical
99
%
T;
EPA
Reg.
No.
2719­
109.
It
is
subject
to
a
TRED.

The
Reregistration
Eligibility
Decision
Document
issued
6/
94.
2
The
Registration
Standard
issued
7/
87.

The
product
chemistry
data
base
is
essentially
complete.
There
are
no
reported
impurities
of
toxicological
concern
in
tebuthiuron.
The
Series
830
physical
and
chemical
properties
are
given
in
the
table
below.

GLN
MRID
Data
6302
Color
40493802
off­
white
6303
Physical
state
"
crystalline
solid
6304
Odor
"
pungent
7200
MP
"
161.5­
164
C
7300
Bulk
density
"
0.579
g/
cc
7840
Water
solubility
"
2.5
mg/
mL
@
25
C
7950
vp
"
2
x
10
­6
mm
Hg
@
25
C
7550
log
Pow
"
1.79
6313
Stability
"
stable
for
3
yrs
&
for
6
mo.
@
normal
and
elevated
temperatures,
respectively.
No
light
instability
or
corrosiveness
to
metal
has
been
observed.

cc:
Reg.
Std.
file,
RF,
Dockter,
S.
Piper,
R.
Fricke.
RD\
I
Tebuthiuron
TRED
Team.
7509C:
RRB2:
Rm712N:
57886:
KD/
kd
Tebuthiuron.
TRED
[982]
=
D277104.
mem.
